Is I-405 closed right now?
Our state DOT feeds show no closures on I-405 as of . A closure the feeds have not reported will not show here.
I-405 (San Diego Freeway) road conditions today
I-405 in California
Our feeds show 0 closures, 1 crash and 0 work zones on I-405 in California.
California road conditions →0Incidents
8Alerts in its states
1States
5Hazards
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Route overview
Interstate 405 is a 72-mile auxiliary route of I-5 through the western Los Angeles Basin and Orange County, running from Irvine in the south to San Fernando in the north. Despite its modest length, it carries some of the highest traffic volumes of any urban interstate in the United States. I-405 is among the busiest interstate freeways in the country. Caltrans recorded an annual average daily traffic of 374,000 between exits 21 and 22 in Seal Beach in 2008, which the FHWA identified as the highest traffic count in the nation, and the heavily traveled Sepulveda Pass between West LA and the San Fernando Valley carries a major share of the freeway's load (Wikipedia: Interstate 405 (California), citing FHWA).
For freight, I-405 is the bypass alternative to I-5 through downtown Los Angeles. Container traffic to and from the Port of Long Beach uses both I-405 and I-710, and the Long Beach-to-LAX corridor is one of the most truck-dense urban segments in the country. That said, no I-405 location appears on ATRI's 2024 Top 100 Truck Bottlenecks; the nearest ranked chokepoint is the SR-60/SR-57 interchange, #7 nationally at an average 42.4 mph (ATRI 2024). The route serves LAX directly and connects to virtually every major LA-area freeway: I-105, I-10, I-110, US-101, and I-5 itself at both endpoints.
There is no significant terrain. I-405 is an entirely urban interstate, climbing only over Sepulveda Pass at about 1,170 ft. The dominant operational issues are chronic congestion (peak periods often exceed 4-hour windows), weather-related disruptions are limited to occasional brush fires that close lanes for smoke, and seasonal Santa Ana wind events that affect the Sepulveda Pass.
- Auxiliary route of I-5 through the western LA Basin and Orange County
- 72 miles total, one of the shortest interstates with heaviest peak volumes
- Sepulveda Pass is one of the busiest stretches of urban interstate in the US (FHWA)
- Direct connection to LAX (Century Boulevard exit)
- Concurrent with no other interstate
- Tolled HOT lanes (Express Lanes) operate in Orange and LA counties
- CARB-compliant truck routing applies: pre-2010 trucks restricted
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Key cities & junctions
| State | Mile | City / Junction |
|---|---|---|
| CA | MM 0 | Irvine (I-5 jct) |
| CA | MM 9 | Costa Mesa |
| CA | MM 12 | Huntington Beach |
| CA | MM 22 | Long Beach (I-710 access) |
| CA | MM 30 | Carson (I-110 jct) |
| CA | MM 39 | Inglewood / LAX |
| CA | MM 44 | Culver City |
| CA | MM 49 | West LA / Sepulveda Pass south |
| CA | MM 55 | Sherman Oaks / US-101 jct |
| CA | MM 62 | Van Nuys |
| CA | MM 72 | San Fernando (I-5 jct) |
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Notable hazards & trouble spots
One of the most congested freeways in Los Angeles
Sepulveda Pass (MM 49-55)
I-405 over the Sepulveda Pass between West LA and the San Fernando Valley is one of the most congested freeways in Los Angeles, but it is not the single most-congested segment in the country. INRIX scorecards have ranked LA's I-5 corridor ahead of it, with I-405 placing around #9 nationally (NBC Los Angeles, INRIX 2019 Global Traffic Scorecard). Peak periods extend from 5:30 AM to 10 AM and 3 PM to 8 PM. Caltrans express lanes operate but exclude heavy commercial vehicles in some directions.
Heavy passenger and ground-transportation conflict
LAX area (MM 39)
I-405 at the Century Boulevard / LAX exit is chronically congested with rideshare, taxi, and ground-transportation traffic. Plan freight deliveries to LAX-area warehouses outside 6-10 AM and 2-9 PM.
Multi-interstate convergence near LAX
I-405 / I-110 / I-105 stack (MM 30-35)
The interchange complex around LAX where I-405 meets I-110, I-105, and the cargo facilities is one of the most truck-dense urban areas in the country. Caltrans publishes real-time conditions; plan around peak periods.
Brush fires and high-profile vehicle restrictions
Santa Ana wind events
During Santa Ana wind events in fall and winter, brush fires in the Sepulveda Pass area can close lanes for smoke. Sustained winds also push high-profile trailers. Check Caltrans bulletins before crossing the pass during wind events.
Tolled HOT lanes with vehicle-class restrictions
Orange County Express Lanes (MM 0-22)
I-405 Express Lanes in Orange County operate with dynamic pricing. Heavy commercial vehicles are excluded from some segments; check OCTA Express Lanes rules before entering.
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Active incidents
No active incidents on Interstate 405 in our feeds right now. State DOT feeds are read every 15 minutes and this page is rebuilt every 30 minutes.
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Weather alerts in its states (8)
National Weather Service alerts in force in the states Interstate 405 runs through. Each one covers a county or a forecast zone, which may be far from the Interstate.
- 8 alerts in California: Coastal Flood Advisory, Coastal Flood Warning, Freeze Warning, Frost Advisory, Lake Wind Advisory, Wind Advisory
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FAQ
How long is I-405?
I-405 is 72.41 miles long, running from I-5 in Irvine north through the western LA Basin and Orange County to I-5 again in San Fernando.
Is I-405 a toll road?
The general-purpose lanes are toll-free. Optional Express Lanes (HOT lanes) operate in both Orange County (OC 405 Express) and Los Angeles County (Sepulveda Pass Express Lanes coming online), with dynamic pricing and vehicle-class restrictions for commercial vehicles.
Why is the I-405 so congested?
I-405 over the Sepulveda Pass is the only direct freeway connection between the Westside / coastal LA Basin and the San Fernando Valley. There is no parallel freeway alternative for over 20 miles in either direction, which concentrates an enormous volume of traffic on a single corridor.
What is the difference between I-405 and I-5 in Los Angeles?
I-5 (the Golden State Freeway and Santa Ana Freeway) runs through downtown Los Angeles and is the primary north-south route through the LA Basin. I-405 runs west of I-5, serving the coastal cities (Long Beach, LAX, West LA) and the western San Fernando Valley before rejoining I-5. Most freight serving the Westside or LAX uses I-405; through traffic typically uses I-5.
Does I-405 have HAZMAT restrictions?
I-405 itself does not have a tunnel-based HAZMAT prohibition like some other urban interstates. Standard CHP HAZMAT routing applies, and the Sepulveda Pass and downtown corridors are subject to enhanced enforcement during peak hours.
Interstate 405 Live Map
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