View source for Interstate 405 (California)

{{short description|Interstate Highway in California}}
{{Use mdy dates|date=December 2022}}
{{Use American English|date=March 2023}}
{{Infobox road
| state = CA
| type = I
| route = 405
| alternate_name = San Diego Freeway
| section = 615
| map = {{maplink-road|from=Interstate 405 (California).map}}
| map_custom = yes
| map_notes = I-405 highlighted in red
| length_mi = 72.15
| length_ref = <ref>{{cite web |last=Starks |first=Edward |date=January 27, 2022 |title=Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |access-date=March 19, 2023 |work=FHWA Route Log and Finder List |publisher=[[Federal Highway Administration]]}}</ref>
| established = 1964
| direction_a = South
| terminus_a = {{jct|state=CA|I|5}} in [[Irvine, California|Irvine]]
| junction = {{plainlist|<!-- PER [[WP:USRD/STDS]] NO MORE THAN 7-10 MAJOR INTERSECTIONS HERE!!! DO NOT ADD ANYMORE JUNCTIONS! (This is not meant to be an expansive list of every single major junction here. Thanks.)-->
*{{Jct|state=CA|SR|133}} in Irvine<!--1-->
*{{Jct|state=CA|SR|55|SR|73}} in [[Costa Mesa, California|Costa Mesa]]<!--2-->
*{{Jct|state=CA|I|605|SR|22}} in [[Seal Beach, California|Seal Beach]]<!--3-->
*{{jct|state=CA|I|710}} in [[Long Beach, California|Long Beach]]<!--4-->
*{{jct|state=CA|I|110}} in [[Carson, California|Carson]]<!--5-->
*{{Jct|state=CA|I|105}} near [[Los Angeles International Airport|LAX]]<!--6-->
*{{jct|state=CA|I|10}} in [[West Los Angeles, Los Angeles, California|West Los Angeles]]<!--7-->
*{{jct|state=CA|SR|2}} in [[Westwood, Los Angeles|Westwood]]<!--8-->
*{{jct|state=CA|US|101}} in [[Sherman Oaks, Los Angeles, California|Sherman Oaks]]<!--9-->
*{{Jct|state=CA|SR|118}} in [[Mission Hills, Los Angeles|Mission Hills]]<!--10-->
}}
| direction_b = North
| terminus_b = {{jct|state=CA|I|5}} in [[Sylmar, California|Sylmar]]
| counties = [[Orange County, California|Orange]], [[Los Angeles County, California|Los Angeles]]
| spur_type = I
| spur_of = 5
| previous_type = US
| previous_route = 399
| next_type = US
| next_route = 466
}}

'''Interstate&nbsp;405''' ('''I-405''', [[California English#Freeways|locally referred to]] as '''the 405''')<ref>{{cite web |last1=Richards |first1=Gary |date=November 16, 2015 |title=Roadshow: Why 'The 405' is called 'The 405' |url=https://www.mercurynews.com/2015/11/16/roadshow-why-the-405-is-called-the-405/ |access-date=18 August 2023 |website=The Mercury News}}</ref> is a major north–south [[auxiliary Interstate Highway]] in [[Southern California]]. The entire route is known as the northern segment of the [[San Diego Freeway]]. I-405 is a [[bypass (road)|bypass]] auxiliary route of [[Interstate 5 in California|I-5]], running along the southern and western parts of the [[Greater Los Angeles]] urban area from [[Irvine, California|Irvine]] in the south to [[Sylmar, Los Angeles|Sylmar]] in the north.

I-405, heavily traveled by both commuters and freight haulers along its entire length, is the busiest and most congested freeway in the United States.<ref>{{cite web |url = http://www.timeforkids.com/TFK/teachers/wr/article/0,27972,1099514,00.html |work = Time For Kids |title = U.S. Highways With the Most Traffic |archive-url = https://web.archive.org/web/20110811103657/http://www.timeforkids.com/TFK/teachers/wr/article/0%2C27972%2C1099514%2C00.html |archive-date = August 11, 2011 }}</ref><ref name=":0">{{Cite news |date=2013-08-20 |title=I-405 In LA Named Busiest Interstate In Any U.S. City |url=https://www.cbsnews.com/losangeles/news/i-405-in-la-named-busiest-interstate-in-any-us-city/ |access-date=2024-09-20 |website=CBS Los Angeles |language=en-US}}</ref> The freeway's [[annual average daily traffic]] between exits&nbsp;21 and 22 in [[Seal Beach, California|Seal Beach]] reached 374,000 in 2008, making it the highest count in the nation.<ref name=":0" /> It has played a crucial role in the development of dozens of cities and suburbs along its route through [[Los Angeles County, California|Los Angeles]] and [[Orange County, California|Orange]] counties. It also serves [[Los Angeles International Airport]], [[Long Beach Airport]], and Orange County's [[John Wayne Airport]].

==Route description==
The entirety of I-405 is designated as '''Route 405''' in the state highway system. It is defined as follows in the [[California Codes|California Streets and Highways Code]]'s section 615, subdivision (a):<ref name="SHC615">[https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=SHC&sectionNum=615. California Code, SHC 619.]</ref>

<blockquote>
Route 405 is from [[Interstate 5 (California)|Route 5]] near [[El Toro, California|El Toro]] to Route 5 near [[San Fernando, California|San Fernando]].
</blockquote>

As of January 2025, subdivision (b) of section 615 designates the portion of Route 405 from Bolsa Chica Road to Bolsa Avenue in [[Orange County, California|Orange County]] as the "Little Saigon Freeway."<ref name="SHC615"></ref>

===Orange County===
[[File:Costa Mesa CA (2013) 01.JPG|thumb|left|The Bristol exit near [[South Coast Plaza]] and the [[Segerstrom Center for the Arts]], with [[Saddleback (Orange County, California)|Saddleback]] in the background]]
I-405 begins at the [[El Toro Y]] interchange in southeastern [[Irvine, California|Irvine]] in [[Orange County, California|Orange County]], splitting from its parent [[Interstate 5 in California|I-5]] and inheriting that route's [[San Diego Freeway]] title; I-5 continues north as the [[Santa Ana Freeway]]. The freeway passes immediately south of the [[Irvine Spectrum Center]] mall before intersecting with [[California State Route 133|State Route&nbsp;133]] (SR&nbsp;133). It then continues through Irvine, passing north of the [[University of California, Irvine]], and then along the northern boundary of [[John Wayne Airport]]. After passing the airport, the freeway enters [[Costa Mesa, California|Costa Mesa]] and has an interchange with [[California State Route 55|SR&nbsp;55]]. It passes [[South Coast Plaza]] before a partial interchange with [[California State Route 73|SR&nbsp;73]], which serves as a partially-tolled bypass of I-405 between Costa Mesa and [[Laguna Niguel, California|Laguna Niguel]].

The freeway then travels through [[Fountain Valley, California|Fountain Valley]] and along the edges of [[Westminster, California|Westminster]] and [[Huntington Beach, California|Huntington Beach]] before entering [[Seal Beach, California|Seal Beach]], where it begins to [[Concurrency (road)|run concurrently]] with [[California State Route 22|SR&nbsp;22]]. It continues along the northern edge of Seal Beach, passing between [[Naval Weapons Station Seal Beach]] and [[Joint Forces Training Base - Los Alamitos]], before SR&nbsp;22 splits from I-405 and continues west while the freeway turns north. I-405 then intersects the southern end of [[Interstate 605|I-605]] before crossing the [[San Gabriel River (California)|San Gabriel River]] and entering [[Los Angeles County, California|Los Angeles County]].

===Los Angeles County===
I-405 enters Los Angeles County in the city of [[Long Beach, California|Long Beach]]. It passes to the north of [[California State University, Long Beach]], and then along the south of [[Long Beach Airport]]. The freeway then intersects with [[Interstate 710|I-710]] before entering [[Carson, California|Carson]] (and crossing through a small sliver of the city of [[Los Angeles]] before reentering Carson). It passes near [[California State University, Dominguez Hills]], and [[Dignity Health Sports Park]], home of [[Major League Soccer]] club [[LA Galaxy]]. A [[weigh station]] for both directions is located in Carson between the Avalon Boulevard and [[Main Street (Los Angeles)|Main Street]] exits.

[[File:405 freeway from the air.jpg|thumb|The I-405 freeway as seen from a plane landing at [[Los Angeles International Airport]]]]
The freeway then intersects with [[Interstate 110 (California)|I-110]] as it briefly reenters the city of Los Angeles by passing through the [[Harbor Gateway, Los Angeles|Harbor Gateway]], a [[Shoestring annexation|strip of land]] connecting [[San Pedro, Los Angeles|San Pedro]] to the rest of the city. I-405 then continues to roughly parallel the contour of the coastline as it passes through the [[South Bay (Los Angeles)|South Bay]] communities of [[Torrance, California|Torrance]], [[Lawndale, California|Lawndale]], [[Redondo Beach, California|Redondo Beach]], [[Hawthorne, California|Hawthorne]], and [[El Segundo, California|El Segundo]]. The freeway then encounters [[Interstate 105 (California)|I-105]] on the southeastern corner of [[Los Angeles International Airport]]. It passes to the east of the airport, serving it with exits at the [[Imperial Highway]] and [[Century Boulevard]].

I-405 next passes through [[Inglewood, California|Inglewood]], coming near [[SoFi Stadium]], home to the [[Los Angeles Rams]] and [[Los Angeles Chargers]] of the [[National Football League]]. It then passes through [[Westchester, Los Angeles|Westchester]] and [[Culver City, California|Culver City]] where it meets [[California State Route 90|SR&nbsp;90]], the Marina Freeway. It serves the Los Angeles neighborhoods of [[Mar Vista, Los Angeles|Mar Vista]] and [[West Los Angeles]] while passing a few miles east of [[Santa Monica, California|Santa Monica]], intersecting with [[Interstate 10 in California|I-10]] in the process. The freeway continues into [[Westwood, Los Angeles|Westwood]], passing just to the west of [[University of California, Los Angeles]]. It then passes the [[Getty Center]] as it ascends [[Sepulveda Pass]] through the [[Santa Monica Mountains]].

[[File:Sandiegofreeway.jpg|thumb|left|I-405 near the interchange with the [[Ventura Freeway]] ([[U.S. Route 101 in California|US&nbsp;101]])]]
After cresting the mountains, I-405 descends into the [[San Fernando Valley]], intersecting [[U.S. Route 101 in California|US Route&nbsp;101]] (US&nbsp;101) in the [[Sherman Oaks, Los Angeles|Sherman Oaks]] neighborhood of Los Angeles. The freeway then continues due north through the western part of the valley, passing east of [[Van Nuys Airport]] and [[California State University, Northridge]]. It intersects [[California State Route 118|SR&nbsp;118]] in the [[Mission Hills, Los Angeles|Mission Hills]] area before ending in a merge with I-5 in [[Sylmar, Los Angeles|Sylmar]].

I-405 is part of the [[California Freeway and Expressway System]]<ref name="cafes">{{CAFESystem}}</ref> and is part of the [[National Highway System (United States)|National Highway System]],<ref name=fhwa-nhs>{{FHWA NHS map|region=losangeles|access-date=July 29, 2017}}</ref> a network of highways that are considered essential to the country's economy, defense, and mobility by the [[Federal Highway Administration]].<ref name=NHS-FHWA>{{FHWA NHS}}</ref> The entire freeway is known as the San Diego Freeway, and parts of it are less commonly known as the Sepulveda Freeway (after [[Sepulveda Boulevard]]).<ref>{{CA Named Freeways | pages=94, 335, 341}}</ref>
{{-}}

{{wide image|Los angeles from getty panorama.jpg|2000px|The view from the [[Getty Center]], south of the Sepulveda Pass, looking east, south, and west. I-405 can be seen at the center.}}

==Express lanes==
[[High-occupancy toll]] (HOT) lanes along I-405 between [[California State Route 73|SR&nbsp;73]] in [[Costa Mesa, California|Costa Mesa]] and [[Interstate 605|I-605]] in [[Seal Beach, California|Seal Beach]] opened on December 1, 2023. This was part of the I-405 Improvement Project that started construction in March 2018. The project included converting the existing [[high-occupancy vehicle lane|high-occupancy vehicle (HOV) lanes]], with them closing in November to test the tolling equipment. In addition, two lanes were added in each direction, one toll lane and one general purpose lane, making the upgrade from five to seven lanes in each direction.<ref name="iteris"/><ref name="OC Express Lanes">{{cite web |url = https://www.octa.net/Projects-and-Programs/Under-Construction/I-405-Improvement-Project/405-Express-Lanes/ |title = 405 Express Lanes |work = Orange County Transportation Authority |access-date = March 19, 2023 }}</ref><ref name="OC Register">{{cite web|url=https://www.ocregister.com/2023/10/23/new-405-freeway-lanes-opening-set-for-dec-1/|title=New 405 Freeway lanes opening set for Dec. 1|website=The Orange County Register|date=October 23, 2023|access-date=November 4, 2023}}</ref>

{{As of|January 2025}}, the HOT lanes are a [[24/7 service]]. Solo drivers are tolled using a [[congestion pricing]] system based on the real-time levels of traffic. For two-person carpools, they are charged the posted toll during weekday peak hours between 6:00&nbsp;am and 10:00&nbsp;am and between 3:00&nbsp;pm and 8:00&nbsp;pm and weekend peak hours between 1:00&nbsp;pm and 6:00&nbsp;pm; no toll would charged during off-peak hours until {{frac|3|1|2}} years after their opening. Carpools with three or more people and motorcycles are not charged. All tolls are collected using an [[open road tolling]] system, and therefore there are no toll booths to receive cash. Each vehicle using the HOT lanes is required to carry a [[FasTrak]] ''Flex'' transponder with its switch set to indicate the number of the vehicle's occupants (1, 2, or 3+). Those with clean air vehicles need to apply to get a 15 percent discount. Solo drivers may also use the FasTrak standard tag without the switch. Drivers without any FasTrak tag will be assessed a toll violation regardless of whether they qualified for free.<ref>{{Cite web |title=How to drive the Express Lanes |url=https://www.405expresslanes.com/en/how-it-works/how-it-works/ |website=405expresslanes.com |publisher=Orange County Transportation Authority |access-date=January 12, 2025}}</ref>

==Traffic congestion==
[[File:The 405 in the Sepulveda Pass.JPG|thumb|right|I-405 in Sepulveda Pass]]
The freeway is one of the busiest freeways in the nation and is the busiest freeway in California.<ref name="iteris">{{Cite web|title=5 Things You Should Know About The I-405 Improvement Project {{!}} Iteris, Inc.|url=https://www.iteris.com/blog/5-things-you-should-know-about-i-405-improvement-project|date=January 29, 2018|access-date=February 24, 2022|website=www.iteris.com}}</ref> The freeway's congestion problems have led to jokes that the road was numbered 405 because traffic moves at "four or five" miles per hour ({{convert|4|or|5|mph|disp=output only|km/h}}), or because drivers had spent "four or five" hours to travel anywhere. Indeed, average speeds as low as {{convert|5|mph|km/h|abbr=on}} are routinely recorded during morning and afternoon commutes, and its interchanges with the [[Ventura Freeway]] ([[U.S. Route 101 in California|US&nbsp;101]]) and with the [[Santa Monica Freeway]] ([[Interstate 10 in California|I-10]]) each consistently rank among the five most congested freeway interchanges in the US.{{cn|date=June 2023}} As a result of these congestion problems, delays passing through the entirety of [[Greater Los Angeles]] using this bypass route instead of merely using the primary route I-5 through [[Downtown Los Angeles]] may be present.

I-405 is the only major north–south freeway in the densely populated areas between [[West Los Angeles]] and Downtown Los Angeles, crossing the [[Santa Monica Mountains]] and connecting the [[San Fernando Valley]] and the [[Los Angeles Basin]]. It is also a major connection for traffic en route to either the [[Port of Los Angeles]], the [[Port of Long Beach]], [[Los Angeles International Airport]], or [[SoFi Stadium]]. By 2040, this corridor is estimated to increase by 35&nbsp;percent and travel times reduced by 75&nbsp;percent.<ref name="iteris"/>{{dubious|date=December 2023}} The freeway's West Los Angeles section is the subject of annual gridlock photos and videos taken during the [[Thanksgiving (United States)|Thanksgiving]] holiday weekend, most often from an aerial view.<ref>{{cite news |last=Grad |first=Shelby |date=November 27, 2019 |title=How 405 Freeway gridlock became the iconic image of an L.A. Thanksgiving |url=https://www.latimes.com/california/story/2019-11-27/how-405-freeway-gridlock-became-the-iconic-image-of-l-a-thanksgiving |work=Los Angeles Times |accessdate=June 29, 2023}}</ref>

Another parallel freeway was proposed to connect the valley and basin (the [[Laurel Canyon Freeway]] or [[La Cienega Freeway]]) but has faced [[upper-class]] and [[NIMBY]] homeowner opposition.<ref>{{cite web |title = Crossroads of Confusion |url = https://www.latimes.com/archives/la-xpm-1998-mar-20-me-30851-story.html |work = Los Angeles Times |date = March 20, 1998 |page = 2 |access-date = October 11, 2012 }}</ref> Despite four years of construction disruptions and billions of dollars of public money, ''[[Los Angeles Times]]'' commentary claims traffic with the lane expansions is actually just as bad or worse.<ref>{{cite news |title = Four ways the 405 freeway project has not made your life better |first = Carla |last = Hall |date = December 2, 2014 |url = http://www.latimes.com/opinion/opinion-la/la-ol-405-freeway-traffic-closures-20141202-story.html |work = Los Angeles Times }}</ref> 

Unlike some of the other major travel corridors in the region (such as [[Interstate 5 in California|I-5]] which parallels the [[LOSSAN Corridor]]), I-405 has no rail-based public transit which parallels it along the west side of Orange and Los Angeles counties. There is a proposal for a [[Sepulveda Transit Corridor]] which would parallel I-405 through [[Sepulveda Pass]], one of the major bottlenecks on the route, which would ease congestion by providing an alternative to driving.

==History==
{{Infobox road small
|state=CA
|type=CA 1957
|route=7
|location=[[Palos Verdes Peninsula]]–[[New Pine Creek, California|New Pine Creek]]
|formed=1934
|deleted=1964
}}
[[File:Los Angeles, California 1955 Yellow Book.jpg|thumb|1955 map of the planned Interstates in the Los Angeles area; present-day I-405 roughly corresponds to the 1955 proposed route through the western regions of the area.]]
[[File:CA 54 I5 FHWA 1957 5599 5.jpg|thumb|right|Temporary terminus during construction at the [[Sunset Boulevard]] interchange in 1957. The interstate continues into [[Sepulveda Boulevard]] via a temporary connector road.]]
[[File:Marilyn Reece and Carol Schumaker.jpg|thumb|Civil engineers [[Marilyn Jorgenson Reece]] (left) and Carol Schumaker, at the Reece-designed I-10/I-405 interchange, 1964]]

I-405 was approved as a chargeable Interstate (in other words, an Interstate financed with federal funds) in 1955. The Division of Highways originally requested I-9 for the corridor, while the Santa Ana Freeway would be I-11;<ref>{{cite map |date=May 1957 |title=Interstate Highway System Adjusted and Approved by Commissioner of Public Roads |inset=Los Angeles area |publisher=California State Department of Public Works, Division of Highways}}</ref> I-3 was later requested in April 1958 before the Division of Highways agreed to use I-405.<ref name="grmservices">{{cite letter |last=McCoy |first=George T. |recipient=A. E. Johnson |date=April 1, 1958 |title=Correspondence Concerning Route Numbering of the Interstate Urban Network |location=Sacramento |publisher=American Association of State Highway Officials |url=https://grmservices.grmims.com/vsearch/portal/public/na4/aashto/default |via=AASHTO Route Numbering Archive |accessdate=June 29, 2023}}</ref> Construction began in 1957 with the first section,{{cn|date=June 2023}} mostly north of [[Los Angeles International Airport]], which was completed in 1961 and initially signed as SR&nbsp;7.{{cn|date=June 2023}} The {{convert|5.7|mi|km|adj=mid}} section through Sepulveda Pass was dedicated on December 21, 1962, and cost $20&nbsp;million to construct. It was designed with a maximum grade of 5.5&nbsp;percent and required the relocation of Sepulveda Boulevard and the [[Mulholland Highway]], which was moved {{convert|1.1|mi|km}} to the south along a new {{convert|579|ft|m|adj=mid|-long}} bridge over the freeway.<ref>{{cite news |date=September 23, 1962 |title=Big New Highway Open In Sepulveda Canyon |page=1 |work=[[The Van Nuys News]] |url=https://www.newspapers.com/article/the-van-nuys-news-and-valley-green-sheet/127341153/ |via=Newspapers.com |accessdate=June 29, 2023}}</ref><ref>{{cite web |title = How the Mulholland Drive bridge was constructed |url = http://thesource.metro.net/2011/01/11/how-mulholland-dr-bridge-was-constructed-2/ |publisher = Los Angeles County Metropolitan Transportation Authority |date = January 11, 2011 |first = Ned |last = Racine |access-date = July 16, 2011 }}</ref> Additional sections west of [[Alameda Street]] were completed in 1962 and 1963, creating {{convert|41.8|mi|km}} of continuous freeway.<ref>{{cite news |last=Gnerre |first=Sam |date=December 6, 2021 |title=South Bay history: Piecing together the construction of the 405 Freeway through the South Bay |url=https://www.dailybreeze.com/2021/12/06/south-bay-history-piecing-together-the-construction-of-the-405-freeway-through-the-south-bay/ |work=[[Daily Breeze]] |accessdate=June 29, 2023}}</ref>

The highway was renumbered to I-405 during the [[1964 state highway renumbering (California)|1964 state highway renumbering]].{{cn|date=June 2023}} The Orange County portion of the San Diego Freeway took 13 years to construct, with the first section opening in 1958;<ref name="PT-1969">{{cite news |last=Sanders |first=Bob |date=January 12, 1969 |title=13-Year Job Completed on San Diego Freeway |page=B1 |work=Press-Telegram |url=https://www.newspapers.com/article/press-telegram-13-year-job-completed-on/127342126/ |via=Newspapers.com |accessdate=June 29, 2023}}</ref> The final section of I-405, {{convert|8|mi|km}} leading to I-5 in Irvine, was dedicated on December 6, 1968, and opened to traffic in January 1969.<ref name="PT-1969"/><ref>{{cite news |last=Hebert |first=Ray |date=December 9, 1968 |title=San Diego Freeway Now Reality |at=part II, p. 1 |work=Los Angeles Times |url=https://www.newspapers.com/article/the-los-angeles-times-san-diego-freeway/127342204/ |via=Newspapers.com |accessdate=June 29, 2023}}</ref>

==="Carmageddon"===
A section of I-405 was closed over the weekend of Friday, July 15, 2011, as part of the Sepulveda Pass Improvements Project.<ref name=MulBridge>{{cite web |url = http://www.ibtimes.com/interstate-405-carmageddon-history-myth-trivia-299287 |title = Interstate 405: The 'Carmageddon', History, Myth and Trivia |website = [[International Business Times]] |date = July 16, 2011 |quote = During 53 hours of closure, the north side of the Mulholland Bridge will be demolished as part of the $1 billion Sepulveda Pass Improvements Project. }}</ref> Before the closing, local radio DJs and television newscasts referred to it as "Carmageddon" and "Carpocalypse", parodying the notion of [[Armageddon]] and the [[Apocalypse]], since it was anticipated that the closure would severely impact traffic.<ref>{{cite web |first = Judy |last = Gish |date = June 2011 |url = http://www.dot.ca.gov/dist07/Publications/Inside7/story.php?id=651 |title = I-405 Summer Weekend Closure Planned  |work = Inside Seven |publisher = California Department of Transportation District 7 |access-date = January 26, 2013 |archive-url = https://web.archive.org/web/20150912102517/http://www.dot.ca.gov/dist07/Publications/Inside7/story.php?id=651 |archive-date= September 12, 2015 }}</ref><ref>{{cite web |last = Gostar |first = Reza |url = http://brentwood.patch.com/articles/carpocalypse-the-weekend-the-405-freeway-will-stand-still |title = Carpocalypse: The Weekend the 405 Freeway Will Stand Still – Brentwood, California Patch |publisher = Brentwood.patch.com |date = June 9, 2011 |access-date = January 26, 2013 |archive-url = https://web.archive.org/web/20120718034543/http://brentwood.patch.com/articles/carpocalypse-the-weekend-the-405-freeway-will-stand-still |archive-date = July 18, 2012 |url-status = dead }}</ref> In reality, traffic was lighter than normal across a wide area. The [[California Department of Transportation]] (Caltrans) reported that fewer vehicles used the roads than usual, and those who did travel by road arrived more quickly than on a normal weekend.<ref name=CarFree/> The [[Metrolink (California)|Metrolink]] commuter train system recorded its highest-ever weekend ridership since it began operating in 1991. Ridership was 50&nbsp;percent higher than the same weekend in 2010 and 10&nbsp;percent higher than the previous weekend ridership record, which occurred during the [[U2 360° Tour]] in June 2011.<ref>{{cite web |url = http://thesource.metro.net/2011/07/21/metrolink-sets-weekend-ridership-recording-during-405-closure/ |title = Metrolink sets weekend ridership recording during 405 closure |work = The Source |date = July 21, 2011 |access-date = July 21, 2011 }}</ref> The ''[[Los Angeles Times]]'' on Sunday, July 17, 2011, featured comments and images of people enjoying the moment next to the I-405 freeway with the free-flowing traffic.<ref>{{cite news |first1=Alan | last1=Zarembo | first2=Ari | last2=Bloomekatz | first3=Nicole| last3=Santa Cruz |date=July 17, 2011 |title=L.A. Downshifts and Takes It Easy |newspaper=[[Los Angeles Times]] |url=https://www.pressreader.com/usa/los-angeles-times/20110717/285336153700523|via=[[PressReader]]|access-date=April 7, 2022 }}</ref>

In response to [[JetBlue]]'s offer of special flights between [[Hollywood Burbank Airport]] in Burbank and [[Long Beach Airport]], a [[great-circle distance|distance]] of only {{convert|29|mi|km}}, for $4.00,<ref>{{cite web |url = http://blog.jetblue.com/405-freeway-closure-were-so-over-it/ |title = JetBlue — 405 Freeway Closure? We're So Over It! |date = July 13, 2011 |publisher = JetBlue |access-date = January 26, 2013 }}</ref><ref>{{cite web |url = http://www.gcmap.com/mapui?P=bur-lgb |title = Great Circle Mapper |publisher = Gcmap.com |access-date = January 26, 2013 }}</ref> a group of cyclists did the same journey in one and a half hours, compared to two and a half hours by plane (including a drive to the airport from West Hollywood 90&nbsp;minutes in advance of the flight and travel time to the end destination).<ref>{{cite news |url = https://www.independent.co.uk/news/world/americas/la-avoids-feared-carmageddon-traffic-jam-2315253.html |title = LA avoids feared 'Carmageddon' traffic jam |work = The Independent |location = London |date = July 17, 2011 |access-date = July 17, 2011 }}</ref> There was also some debate about whether the Los Angeles area could benefit from [[Car-Free Days|car-free weekends]] regularly.<ref name=CarFree>{{cite news |url = https://www.latimes.com/archives/la-xpm-2011-jul-19-la-me-carmageddon-20110719-story.html |title = In 'Carmageddon,' some see road map for the future |last1 = Mather |first1 = Kate |last2 = Bloomekatz |first2 = Ari |last3 = Saillant |first3 = Saillant |work = Los Angeles Times |date = July 19, 2011 |access-date = August 1, 2011 }}</ref>

The [[Los Angeles County Metropolitan Transportation Authority]] then had full closure of a {{convert|10|mi|km|adj=on}} stretch of I-405 on the weekend of September 29–30, 2012, while construction crews worked to demolish a portion of the Mulholland Bridge.<ref name="Carmageddon 2012">{{cite web |url = http://malibu.patch.com/articles/carmageddon-ii-announced-405-closure-eminent#c |title = Carmageddon 2012 Announced, Full 405 Closure in September |date = July 19, 2012 |access-date = September 4, 2012 |last = Morgan |first = Jared |archive-date = August 25, 2012 |archive-url = https://web.archive.org/web/20120825181926/http://malibu.patch.com/articles/carmageddon-ii-announced-405-closure-eminent#c |url-status = dead }}</ref>

Researchers at the [[University of California, Los Angeles]], used the closure of I-405 to study particulate matter air pollution. The researchers took air samples before, during, and after the closure. The researchers found an 83-percent reduction in ultrafine [[Particulates|particles]], 55-percent reduction in fine particle matter, and 62-percent less [[black carbon]].<ref>{{Cite journal |last1 = Winer |first1 = Arthur |last2 = Zhu |first2 = Yifang |last3 = Paulson |first3 = Suzanne |date = Spring 2014 |title = Carmageddon or Carmaheaven? Air Quality Results of a Freeway Closure |url = http://uctc.berkeley.edu/access/44/access44_carmaheaven.pdf |journal = Access |volume = 44 |pages = 17–21 |access-date = November 22, 2017 |archive-date = December 1, 2017 |archive-url = https://web.archive.org/web/20171201034632/http://uctc.berkeley.edu/access/44/access44_carmaheaven.pdf |url-status = dead }}</ref>

===Sepulveda Pass Improvements Project===
The $1-billion Sepulveda Pass Improvements Project added a [[high-occupancy vehicle]] (HOV) lane and associated changes to freeway entrances, exits, and underpasses along a {{Convert|10|mi|km|adj=on}} stretch through [[Sepulveda Pass]] between I-10 and US&nbsp;101/Ventura Boulevard.<ref>{{cite web |url = http://www.metro.net/projects/I-405/ |title = Sepulveda Pass Improvement Project |publisher = Los Angeles County Metropolitan Transportation Authority |access-date = July 15, 2011 }}</ref> The project was completed as a [[design–build]] in contrast to the traditional [[design–bid–build]] used typically in infrastructure improvement. This section of I-405 was closed for a weekend in mid-July 2011 to demolish the [[Mulholland Drive|Mulholland Drive Bridge]], and a {{convert|10|mi|km|adj=on}} section was closed for the last weekend of September 2012.<ref name=MulBridge/>

'''Jamzilla''' was the name for the I-405 closure on [[Presidents' Day]] weekend 2014. There were lane closures and complete closures on I-405 starting February 14 at 10:00&nbsp;pm until February 18 at 6:00&nbsp;am to pave and restripe the northbound lanes.<ref>{{cite web |url = http://www.latimes.com/local/lanow/la-me-ln-jamzilla-to-begin-20140214,0,2800810.story#axzz2tLp4gBBF |title = Jamzilla lane closures on the 405 Freeway begin tonight |last = Groves |first = Martha |date = February 14, 2014 |work = Los Angeles Times |access-date = October 4, 2014 }}</ref>

On May 23, 2014, the {{convert|10|mi|km|adj=on}} HOV lane was opened to traffic.<ref>{{cite news |url = http://abc7.com/traffic/carpool-lane-on-north-405-freeway-opens/74789/ |title = Carpool lane on North 405 Freeway opens |publisher = KABC-TV |location = Los Angeles |date = May 23, 2014 |access-date = May 23, 2014 }}</ref>

==Future==
[[File:I-405 at I-105 aerial.jpg|thumb|Aerial view from the north of I-405's interchange with I-105 near Los Angeles International Airport from directly above Arbor Vitae Street; the hills of the [[Palos Verdes Peninsula]] are visible in the distance]]

===Manchester and Century Boulevard interchanges===
Proposed changes between the Manchester and Century Boulevard interchanges in the city of [[Inglewood, California|Inglewood]] are to provide a new southbound onramp and a new northbound offramp for Arbor Vitae Street, to reconstruct and widened the Arbor Vitae Street over-bridge and replace the Century Boulevard overcrossing structure.<ref>{{cite web |author= District 7 |url = http://www.dot.ca.gov/dist07/sync/cpimages/file/405%20on%20the%20Move_PR.pdf |title = Interstate 405: On- and Off-Ramp Improvements at Arbor Vitae Street |publisher = California Department of Transportation }}</ref> This work would reduce congestion on the approach to [[Los Angeles International Airport]].{{Citation needed|date=July 2011}}{{dubious|date=December 2023}} [[California Department of Transportation|Caltrans]] has not yet issued a start date for this work.

===Sepulveda Pass express lanes===
The HOVs lane that were constructed as part of the Sepulveda Pass Improvements Project are proposed to be upgraded to express lanes by 2028.<ref>{{cite web |url = https://www.metro.net/projects/i-405-expresslanes-project/ |title = I-405 Sepulveda Pass ExpressLanes Project |work = Los Angeles County Metropolitan Transportation Authority |access-date = August 10, 2022 }}</ref>{{Update after|2028}}

==Exit list==
{{CAinttop|exit
|length_ref=<ref name=calnexus/><ref name=trucklist>{{Caltrans trucklist}}</ref><ref name=bridgelog>{{cite web|url=http://www.dot.ca.gov/hq/structur/strmaint/brlog/logpdf/logd07.pdf|archive-url=https://web.archive.org/web/20070629224600/http://www.dot.ca.gov/hq/structur/strmaint/brlog/logpdf/logd07.pdf|url-status=dead|title=California Log of Bridges on State Highways: District 7|website=[[Caltrans]]|date=October 2006|archive-date=June 29, 2007|access-date=September 19, 2019}}</ref><ref>California Department of Transportation, [http://traffic-counts.dot.ca.gov/ All Traffic Volumes on CSHS], 2005 and 2006</ref>
|exit_ref=<ref name=calnexus>{{cite web |date=March 17, 2020 |publisher=[[California Department of Transportation]] |work= [[California Numbered Exit Uniform System]] |url=https://dot.ca.gov/-/media/dot-media/programs/safety-programs/documents/exit/calnexus-i-405-03-2020-a11y.pdf |title= Interstate 405 Freeway Interchanges |access-date=October 22, 2020}}</ref>
}}
{{CAint|exit
|county=Orange
|cspan=40
<!-- |county_note=ORA 0.23–24.18 -->
|location=Irvine
|lspan=12
|type=incomplete
|mile=0.00
|exit=
|road={{Jct|state=CA|I|5|dir1=south|name1=[[San Diego Freeway]] south|city1=San Diego}}
|notes=Southern terminus; [[El Toro Y]]; no access to I-5 north; I-5 north exit 94A; San Diego Freeway continues as I-5 south; former [[U.S. Route 101 in California|US&nbsp;101]] south
}}
{{CAint|exit
|type=incomplete
|mile=0.72
|mspan=3
|exit=1A
|road=Lake Forest Drive
|notes=No northbound exit
|nspan=2
}}
{{CAint|exit
|type=incomplete
|mile=none
|exit=1B
|road=Bake Parkway
|notes=none
}}
{{CAint|exit
|mile=none
|exit=1C
|road=Irvine Center Drive
|notes=Signed as exit 1 northbound
}}
{{CAint|exit
|type=hov
|mile=
|exit=♦
|road={{Jct|state=CA|I|5|dir1=south}}
|notes=[[High-occupancy vehicle lane|HOV]] access only; southbound exit and northbound entrance
}}
{{CAint|exit
|mile=1.57
|mspan=2
|exit=2
|espan=2
|road={{Jct|state=CA|SR|133|dir1=south|name1=[[Laguna Freeway]]|city1=Laguna Beach}}
|notes=SR 133 north exit 8
}}
{{CAint
|type=incomplete
|mile=none
|road={{Jct|state=CA|SR|133|dir1=north|name1=[[Laguna Freeway]]}} to [[Eastern Toll Road|toll road]]
|notes=Southbound exit and northbound entrance; SR 133 south exits 8A-B
}}
{{CAint|exit
|mile=2.65
|exit=3
|road=Shady Canyon Drive / Sand Canyon Avenue
}}
{{CAint|exit
|mile=3.72
|exit=4
|road=Jeffrey Road / University Drive
}}
{{CAint|exit
|mile=5.39
|exit=5
|road=Culver Drive
}}
{{CAint|exit
|mile=6.69
|exit=7
|road=[[Jamboree Road]]
}}
{{CAint|exit
|mile=7.57
|exit=8
|road={{jct|extra=airport}} MacArthur Boulevard&nbsp;– [[John Wayne Airport]]
}}
{{CAint|exit
|location=Costa Mesa
|lspan=11
|mile=8.51
|mspan=2
|exit=9A
|espan=2
|road={{Jct|state=CA|SR|55|dir1=north|name1=[[Costa Mesa Freeway]]}}
|notes=SR&nbsp;55 south exits 6A-B
}}
{{CAint
|type=incomplete
|mile=none
|road={{Jct|state=CA|SR|55|dir1=south|name1=[[Costa Mesa Freeway]]}}
|notes=Northbound exit and southbound entrance; southbound access is via exit 10; SR&nbsp;55 north exit 6
}}
{{CAint|exit
|type=hov
|mile=
|exit=♦
|road={{Jct|state=CA|SR|55|dir1=north}}
|notes=[[High-occupancy vehicle lane|HOV]] access only
}}
{{CAint|exit
|mile=9.28
|mspan=2
|exit=9B
|espan=2
|road=Anton Boulevard / Avenue of the Arts / Bristol Street
|notes=Northbound signage
}}
{{CAint
|mile=none
|road=Bristol Street
|notes=Southbound signage
}}
{{CAint|exit
|type=etc
|mile=
|exit=—
|road=405 Express Lanes
|notes=South end of express lanes; opened in December 2023<ref name="OC Express Lanes"/><ref name="OC Register"/>
}}
{{CAint|exit
|type=incomplete
|mile=10.05
|mspan=3
|exit=10
|road={{Jct|state=CA|SR|73|dir1=south|name1=[[Corona del Mar Freeway]]|to2=to|SR|55|dir2=south|name2=[[Costa Mesa Freeway]]|location1=[[San Diego]] via toll road}}
|notes=Southbound exit and northbound entrance
}}
{{CAint|exit
|type=etc
|mile=none
|exit=—
|road={{Jct|state=CA|SR|73|dir1=south}}
|notes=Express Lanes access only; southbound exit and northbound entrance<ref name="OC Express Lanes"/>
}}
{{CAint|exit
|type=incomplete
|mile=none
|exit=11
|road=South Coast Drive / Fairview Road / Susan Street / [[Harbor Boulevard]]
|notes=Northbound exit only
}}
{{CAint|exit
|mile=10.59
|mspan=2
|exit=11A
|road=Fairview Road
|notes=Signed as part of exit 11 northbound
|nspan=2
}}
{{CAint|exit
|mile=none
|exit=11B
|road=[[Harbor Boulevard]]
|notes=none
}}
{{CAint|exit
|location=Fountain Valley
|lspan=4
|mile=12.24
|exit=12
|road=Euclid Street / Newhope Street / Ellis Avenue
|notes=Ellis Avenue not signed northbound; Newhope Street not signed southbound
}}
{{CAint|exit
|mile=13.55
|exit=14
|road=Brookhurst Street
}}
{{CAint|exit
|mile=14.59
|mspan=2
|exit=15A
|espan=2
|road=Warner Avenue west
|notes=Northbound signage
}}
{{CAint
|mile=none
|road=Warner Avenue east
|notes=Southbound signage
}}
{{CAint|exit
|location1=Fountain Valley
|location2=Huntington Beach
|location3=Westminster
|lspan=2
|mile=14.98
|mspan=2
|exit=15B
|espan=2
|road=Magnolia Street
|notes=Northbound signage
}}
{{CAint
|mile=none
|road=Magnolia Street / Warner Avenue west
|notes=Southbound signage
}}
{{CAint|exit
|location1=Huntington Beach
|location2=Westminster
|mile=16.31
|exit=16
|road={{Jct|state=CA|SR|39|name1=Beach Boulevard|city1=Westminster|city2=Huntington Beach}}
}}
{{CAint|exit
|location=Westminster
|lspan=3
|mile=17.52
|exit=18
|road=Bolsa Avenue / Goldenwest Street
|notes=
}}
{{CAint|exit
|mile=18.93
|exit=19
|road=Westminster Boulevard / Springdale Street
|notes=Springdale Street not signed northbound
}}
{{CAint|exit
|type=incomplete
|mile=20.33
|exit=20
|road=Bolsa Chica Road
|notes=Southbound exit and entrance only
}}
{{CAint|exit
|location1=Westminster
|location2=Garden Grove
|lspan=2
|mile=20.52
|exit=21
|type=concur
|road={{Jct|state=CA|SR|22|dir1=east|road|Valley View Street|name1=[[Garden Grove Freeway]]|city1=Garden Grove}}
|notes=Southern end of SR&nbsp;22 concurrency; southbound exit includes Garden Grove Boulevard and Valley View Street
}}
{{CAint|exit
|type=etc
|mile=
|exit=—
|road={{Jct|state=CA|SR|22|dir1=east}}
|notes=Express Lanes access only; southbound exit and northbound entrance
}}
{{CAint|exit
|location=Seal Beach
|lspan=5
|mile=22.41
|exit=22
|road=Seal Beach Boulevard / Los Alamitos Boulevard
|notes=Los Alamitos Boulevard was former [[California State Route 35 (pre-1964)|SR&nbsp;35]]
}}
{{CAint|exit
|mile=23.05
|mspan=4
|exit=23
|type=concur
|road={{Jct|state=CA|SR|22|dir1=west|name1=7th Street}}
|notes=Northern end of SR&nbsp;22 concurrency; northbound signage; I-605 south exit 1A
}}
{{CAint|exit
|type=etc
|mile=none
|exit=—
|road={{Jct|state=CA|I|605|dir1=north}}
|notes=Express Lanes access only; northbound exit and southbound entrance
}}
{{CAint|exit
|type=etc
|mile=none
|exit=—
|road=405 Express Lanes
|notes=North end of express lanes; opened in December 2023<ref name="OC Express Lanes"/>
}}
{{CAint|exit
|mile=none
|exit=23
|type=incomplete
|road={{Jct|state=CA|SR|22|dir1=west|name1=7th Street|city1=Long Beach}}
|notes=Southbound signage; SR 22 east exit 2; I-605 south exit&nbsp;1A
}}
{{CAint|exit
|county1=Orange
|county2=Los Angeles
|cspan=2
|location1=Seal Beach
|location2=Long Beach
|location3=Los Alamitos
|mile=23.81
|exit=24A
|road={{Jct|state=CA|I|605|dir1=north|name1=[[San Gabriel River Freeway]]}}
|notes=Signed as exit 24 northbound; I-605 north exit 1A, south exits 1B-C; SR&nbsp;22 exit&nbsp;2
}}
{{CAint|exit
|location1=Seal Beach
|location2=Long Beach
|mile=23.95
|place=[[San Gabriel River (California)|San Gabriel River]]
}}
{{CAint|exit
|county=Los Angeles
|cspan=65
<!-- |county_note=LA 0.00–48.64 -->
|location=Long Beach
|lspan=6
|type=incomplete
|mile=24.40
|exit=24B
|road=Studebaker Road
|notes=Southbound exit and northbound entrance
}}
{{CAint|exit
|mile=25.06
|exit=25
|road=Palo Verde Avenue
}}
{{CAint|exit
|type=incomplete
|mile=25.59
|exit=26A
|road=Woodruff Avenue
|notes=No southbound exit
}}
{{CAint|exit
|mile=26.13
|exit=26B
|road=Bellflower Boulevard
|notes=Signed as exit 26 southbound
}}
{{CAint|exit
|mile=27.27
|exit=27
|road={{Jct|state=CA|SR|19|name1=[[Lakewood Boulevard]]|city1=Long Beach Airport|extra=airport}}
}}
{{CAint|exit
|mile=28.83
|exit=29
|road=Spring Street / Cherry Avenue&nbsp;– [[Signal Hill, California|Signal Hill]]
|notes=Signed as exits 29A (south) and 29B (north)
}}
{{CAint|exit
|location=Signal Hill
|mile=29.37
|exit=29C
|road=Orange Avenue
}}
{{CAint|exit
|location1=Signal Hill
|location2=Long Beach
|mile=29.85
|exit=30A
|road=[[Atlantic Avenue (Los Angeles County)|Atlantic Avenue]]
}}
{{CAint|exit
|location=Long Beach
|lspan=5
|mile=30.11
|exit=30B
|road=[[Long Beach Boulevard (California)|Long Beach Boulevard]]
|notes=Former [[California State Route 15 (pre-1964)|SR&nbsp;15]]
}}
{{CAint|exit
|type=incomplete
|mile=31.37
|exit=32A
|road=Pacific Avenue
|notes=Southbound exit and northbound entrance
}}
{{CAint|exit
|mile=31.83
|exit=32B
|road={{Jct|state=CA|I|710|dir1=south|name1=[[Long Beach Freeway]]|city1=Long Beach}}
|notes=Signed as exits 32A (north) and 32B (south) northbound; I-710 exit 4
|nspan=2
}}
{{CAint|exit
|mile=31.83
|exit=32C
|road={{Jct|state=CA|I|710|dir1=north|name1=[[Long Beach Freeway]]|city1=Pasadena}}
|notes=none
}}
{{CAint|exit
|mile=31.87
|exit=32D
|road=Hughes Way / Santa Fe Avenue
|notes=Signed as exit 32C northbound; Hughes Way not signed southbound
}}
{{CAint|exit
|location=Carson
|lspan=6
|mile=32.55
|exit=33A
|road=[[Alameda Street]] ([[California State Route 47|SR&nbsp;47]] south)
|notes=Southbound exit and entrance connects to 223rd Street
}}
{{CAint|exit
|mile=33.33
|exit=33B
|road=Wilmington Avenue
}}
{{CAint|exit
|mile=34.31
|exit=34
|road=Carson Street
}}
{{CAint|exit
|mile=35.00
|exit=35
|road=[[Avalon Boulevard]]
|notes=Northbound exit to Avalon Boulevard south is via exit 34
}}
{{CAint|exit
|type=incomplete
|mile=36.37
|exit=36
|road=[[Main Street (Los Angeles)|Main Street]]
|notes=Northbound exit and southbound entrance
}}
{{CAint|exit
|mile=36.74
|exit=37A
|road={{Jct|state=CA|I|110|name1=[[Harbor Freeway]]|city1=San Pedro|city2=Los Angeles}}
|notes=Signed as exit 37 northbound; former [[U.S. Route 6 in California|US&nbsp;6]]; I-110 exit 9
}}
{{CAint|exit
|location=Los Angeles
|lspan=2
|type=incomplete
|mile=37.01
|exit=37B
|road=[[Vermont Avenue]]
|notes=Southbound exit and northbound entrance
}}
{{CAint|exit
|mile=37.60
|exit=38A
|road=[[Normandie Avenue]]&nbsp;– [[Gardena, California|Gardena]]
}}
{{CAint|exit
|location1=Los Angeles
|location2=Torrance
|mile=38.19
|exit=38B
|road=[[Western Avenue (Los Angeles)|Western Avenue]]
}}
{{CAint|exit
|location=Torrance
|lspan=2
|mile=39.22
|exit=39
|road=[[Crenshaw Boulevard]]
}}
{{CAint|exit
|mile=40.35
|exit=40A
|road={{Jct|state=CA|road|[[Artesia Boulevard]]|CA|91|to2=1}}
|notes=Signed as exit 40 northbound; former [[California State Route 91|SR&nbsp;91]]
}}
{{CAint|exit
|location=Lawndale
|lspan=2
|type=incomplete
|mile=40.65
|exit=40B
|road=Redondo Beach Boulevard&nbsp;– [[Redondo Beach, California|Redondo Beach]]
|notes=Southbound exit and northbound entrance
}}
{{CAint|exit
|mile=41.36
|exit=42A
|road={{Jct|state=CA|SR|107|name1=[[Hawthorne Boulevard (Los Angeles County)|Hawthorne Boulevard]]|city1=Lawndale}}
}}
{{CAint|exit
|location1=Lawndale
|location2=Redondo Beach
|mile=42.01
|exit=42B
|road=Inglewood Avenue
}}
{{CAint|exit
|location=Hawthorne
|lspan=2
|mile=42.98
|exit=43
|road=Rosecrans Avenue&nbsp;– [[Manhattan Beach, California|Manhattan Beach]]
|notes=Signed as exits 43A (east/west) and 43B (west) southbound
}}
{{CAint|exit
|mile=43.99
|exit=44
|road=[[El Segundo Boulevard]]&nbsp;– [[El Segundo, California|El Segundo]]
}}
{{CAint|exit
|location=Lennox
|lspan=2
|mile=44.95
|exit=45A
|road={{Jct|state=CA|I|105|name1=[[Century Freeway]]|city1=El Segundo|city2=Norwalk}}
|notes=Signed as exit 45 southbound; serves [[Los Angeles International Airport]]; I-105 east exit 2, west exit 2B
}}
{{CAint|exit
|mile=44.95
|exit=45B
|road=[[Imperial Highway]]
|notes=Southbound exit is part of exit 46
}}
{{CAint|exit
|location=Inglewood
|lspan=2
|mile=46.00
|exit=46
|road={{jct|extra=airport}} [[Century Boulevard (Los Angeles)|Century Boulevard]]&nbsp;– [[Los Angeles International Airport|LAX Airport]]
}}
{{CAint|exit
|mile=47.13
|exit=47
|road=[[Manchester Boulevard]] / [[La Cienega Boulevard]] / [[Florence Avenue]]
|notes=Manchester Boulevard was former [[California State Route 42|SR&nbsp;42]]
}}
{{CAint|exit
|location=Los Angeles
|lspan=2
|mile=48.05
|exit=48
|road=La Tijera Boulevard
}}
{{CAint|exit
|mile=48.33
|exit=49A
|road=Howard Hughes Parkway / [[Sepulveda Boulevard]]
|notes=Signed as exit 49 southbound
}}
{{CAint|exit
|location=Culver City
|type=incomplete
|mile=49.23
|exit=49B
|road=[[Sepulveda Boulevard]] / [[Slauson Avenue]] ([[California State Route 90|SR&nbsp;90]] east)
|notes=Northbound exit only; SR&nbsp;90 exit 2
}}
{{CAint|exit
|location1=Culver City
|location2=Los Angeles
|lspan=3
|mile=49.70
|mspan=3
|exit=50A
|road=[[Jefferson Boulevard]]
|notes=Signed as exit 50B northbound
}}
{{CAint|exit
|mile=none
|exit=50B
|espan=2
|road={{Jct|state=CA|SR|90|dir1=west|name1=[[Marina Freeway]]|city1=Marina del Ray}}
|notes=Signed as exit 50A northbound; SR 90 east exit 2
}}
{{CAint
|type=incomplete
|mile=none
|road={{Jct|state=CA|SR|90|dir1=east|name1=[[Marina Freeway]]|road|[[Slauson Avenue]]}}
|notes=Southbound exit and northbound entrance; SR 90 west exit 2
}}
{{CAint|exit
|location=Culver City
|lspan=2
|mile=50.97
|exit=51
|road=Culver Boulevard / [[Washington Boulevard (Los Angeles)|Washington Boulevard]]
}}
{{CAint|exit
|mile=51.22
|exit=52
|road=[[Venice Boulevard]] ([[California State Route 187|SR&nbsp;187]]) / [[Washington Boulevard (Los Angeles)|Washington Boulevard]]
}}
{{CAint|exit
|location=Los Angeles
|lspan=4
|type=incomplete
|mile=52.94
|exit=53A
|road=National Boulevard
|notes=Northbound exit and southbound entrance
}}
{{CAint|exit
|mile=53.31
|exit=53B
|road={{Jct|state=CA|I|10|name1=[[Santa Monica Freeway]]|city1=Santa Monica|city2=Los Angeles}}
|notes=Signed as exit 53 southbound; I-10 exits 3A-B
}}
{{CAint|exit
|type=incomplete
|mile=53.96
|exit=54
|road=[[Olympic Boulevard (Los Angeles)|Olympic Boulevard]] / [[Pico Boulevard]]
|notes=Southbound exit and northbound entrance; former [[California State Route 26 (pre-1964)|SR&nbsp;26]]
}}
{{CAint|exit
|mile=54.63
|exit=55A
|road={{Jct|state=CA|SR|2|name1=[[Santa Monica Boulevard]]}}
|notes=Former [[U.S. Route 66 in California|US&nbsp;66]]
}}
{{CAint|exit
|location=none
|mile=55.31
|mile2=55.34
|exit=55B
|road=[[Wilshire Boulevard]]
|notes=Signed as exits 55B (east) and 55C (west) southbound
}}
{{CAint|exit
|location=Los Angeles
|lspan=19
|type=closed
|mile=56.27
|exit=56
|road=[[Montana Avenue]]
|notes=Northbound exit only; demolished<ref>{{cite news |author = <!--Staff writer(s); no by-line.--> |title = 405 Freeway NB Montana Avenue Offramp Dies At 57 |url = http://losangeles.cbslocal.com/2013/11/24/405-freeway-nb-montana-avenue-offramp-dies-at-57/ |publisher = [[KCBS-TV]] |location = Los Angeles |date = November 24, 2013 |access-date = March 19, 2014 }}</ref>
}}
{{CAint|exit
|mile=56.77
|exit=57A
|road=[[Sunset Boulevard]]
|notes=Signed as exit 57 southbound
}}
{{CAint|exit
|type=incomplete
|mile=57.06
|exit=57B
|road=Moraga Drive
|notes=Northbound exit and entrance
}}
{{CAint|exit
|mile=58.54
|exit=59
|road=Getty Center Drive
}}
{{CAint|exit
|mile=60.80
|mspan=2
|exit=61
|road=[[Mulholland Drive]] / Skirball Center Drive
|notes=
}}
{{CAint|exit
|mile=none
|place=[[Sepulveda Pass]], elevation {{Convert|1129|ft}}<ref>{{cite web|url=https://www.google.com/maps/@34.1272273,-118.4745563,3a,75y,81.39h,91.03t/data=!3m6!1e1!3m4!1su9RMSUJd8_GwMDP_wm8h1g!2e0!7i16384!8i8192?hl=en|title=Sepulveda Pass|website=Google Street View|access-date=September 7, 2022}}</ref>
}}
{{CAint|exit
|mile=62.78
|exit=63A
|road=[[Ventura Boulevard]] / [[Sepulveda Boulevard]] / Valley Vista Boulevard
}}
{{CAint|exit
|mile=63.20
|exit=63B
|road={{Jct|state=CA|US|101|name1=[[Ventura Freeway]]|city1=Ventura|city2=Los Angeles}}
|notes=US&nbsp;101 exit 19A
}}
{{CAint|exit
|mile=64.06
|exit=64
|road=Burbank Boulevard
}}
{{CAint|exit
|mile=65.13
|exit=65
|road=[[Victory Boulevard (Los Angeles)|Victory Boulevard]]&nbsp;– [[Van Nuys, Los Angeles|Van Nuys]]
}}
{{CAint|exit
|mile=66.14
|mile2=66.17
|exit=66
|road=[[Sherman Way]]&nbsp;– [[Van Nuys Airport]]
|notes=Signed as exits 66A (east) and 66B (west) northbound
}}
{{CAint|exit
|mile=67.53
|exit=68
|road=Roscoe Boulevard&nbsp;– [[Panorama City, Los Angeles|Panorama City]]
}}
{{CAint|exit
|mile=68.51
|exit=69
|road=[[Nordhoff Street]]
}}
{{CAint|exit
|mile=70.03
|exit=70
|road=Devonshire Street&nbsp;– [[Granada Hills, Los Angeles|Granada Hills]]
}}
{{CAint|exit
|mile=70.62
|mspan=2
|exit=71A
|espan=2
|road={{Jct|state=CA|SR|118|dir1=west|name1=[[Ronald Reagan Freeway]]|city1=Simi Valley}}
|notes=Signed as exit 71 southbound; SR 118 east exit 42A
}}
{{CAint
|type=incomplete
|mile=none
|road={{Jct|state=CA|SR|118|dir1=east|name1=[[Ronald Reagan Freeway]]}}
|notes=Northbound exit and southbound entrance; SR 118 west exit 42B
}}
{{CAint|exit
|type=incomplete
|mile=71.01
|exit=71B
|road=San Fernando Mission Boulevard
|notes=Northbound exit and southbound entrance
}}
{{CAint|exit
|mile=71.53
|exit=72
|road=Rinaldi Street&nbsp;– [[Mission Hills, Los Angeles|Mission Hills]]
}}
{{CAint|exit
|type=incomplete
|mile=72.42
|exit=
|road={{Jct|state=CA|I|5|dir1=north|name1=[[Golden State Freeway]]|city1=Sacramento}}
|notes=Northern terminus; no access to I-5 south; I-5 south exit 158
}}
{{jctbtm|col=7|keys=closed,concur,hov,incomplete,etc}}

==See also==
* {{portal-inline|California Roads}}
* {{portal-inline|Greater Los Angeles}}

==References==
{{reflist}}

==External links==
{{Commons category}}
{{AttachedKML|display=title,inline}}
{{CASR external links|I|405}}
*{{Official website|https://405expresslanes.com/|name=405 Express Lanes official website}}
*[http://www.aaroads.com/california/i-405_ca.html California @ AARoads.com - I-405]
*[http://www.cahighways.org/305-440.html#405 California Highways: I-405]

{{3di|5}}

[[Category:Interstate 5|4 California]]
[[Category:Interstate Highways in California|05-4]]
[[Category:Roads in Los Angeles County, California|Interstate 405]]
[[Category:Roads in Orange County, California|Interstate 405]]
[[Category:Southern California freeways|405]]
[[Category:Auxiliary Interstate Highways|05-4 California]]
[[Category:Transportation in the San Fernando Valley|405]]
[[Category:O. J. Simpson murder case]]