I-405 Improvement Project

I-405 Improvement Project Information

Currently, the San Diego Freeway (I-405) is one of the most congested freeways in Orange County, carrying more than 300,000 vehicle trips in some sections each day. By 2040, traffic volumes on the I-405 are expected to increase significantly. The I-405 Improvement Project will increase freeway capacity, improve traffic and interchange operations, and enhance road safety to meet state and federal standards.

OCTA in cooperation with The California Department of Transportation (Caltrans) is widening the San Diego Freeway (I-405) between State Route 73 (SR-73) and Interstate 605 (I-605). The widening includes the addition of one general purpose lane in each direction on I-405 from Euclid Street to the I-605 interchange, plus tolled express lanes in each direction of I-405 from SR-73 to SR-22 east. The tolled 405 Express Lanes and the existing HOV lanes would be managed jointly as a single tolled express facility with two lanes in each direction from SR-73 to I-605.

For information about the project and to sign up for email alerts, please visit OCTA’s webpage www.octa.net/405improvement or Facebook page www.facebook.com/405improvement.

I-405 Improvement Project Study Area Map


I-405 Express Lanes Update - May 23rd, 2016

Today, Monday, May 23, 2016, the Board of Directors approved the initial 405 Express Lanes Toll Policy and preliminary Interstate 405 Improvement Project Finance Plan. This decision was informed by the Traffic Revenue Study, projected express lanes capital, operating, and maintenance costs, as well as estimated non-toll revenue and leakage. This information, along with current Measure M sales tax revenue forecasts, an updated project cost estimate, and interest rate projections have formed the basis for the initial toll policy and preliminary finance recommendations.

For a copy of the staff report, please click HERE

The California Department of Transportation (CALTRANS) Interstate 405 (I-405) Improvement Project proposes to widen the corridor by adding one general purpose (GP) lane in each direction between Euclid Street and I-605 and one tolled Express Lane in each direction between State Route 73 (SR-73) and State Route 22 (SR-22) east of I-405 to be managed jointly as a tolled Express Facility with two lanes in each direction between SR-73 and I-605. The objective is to open the tolled Express Lanes with a HOV2+ occupancy free to encourage rideshare and transit usage. Operational adjustments to the tolled Express Lanes may be implemented based on demand, rates of speed, traffic volumes, and to meet financial covenants, maintenance and operational obligations. The proposed action would improve the freeway mainline and interchanges on I-405 in Orange and Los Angeles counties for approximately 16 miles between 0.2-mile south of Bristol Street and 1.4 miles north of I-605, as well as portions of SR-22, SR-73, and I-605 to reduce congestion and improve lane continuity through the corridor.

On May 15, 2015 the Record of Decision was signed by the Caltrans District 12 Director.  

More information on the I-405 Improvement Project may be found on the Orange County Transportation Authority's (OCTA) website. 
Click HERE to visit the OCTA Website.

Further information will be posted here as the Project progresses.