I-405 (I-5 to SR-55)
I-405 (I-5 to SR-55)
Project Overview
In 2018, OCTA and Caltrans studied the potential benefits and effects of adding one or two general-purpose lanes in each direction, adding auxiliary lanes and making various operational improvements. A Preferred Alternative was selected. The environmental study phase, also called the Project Approval/Environmental Document (PA/ED) phase, has been completed.
About the Project Area
Interstate 405 between I-5 and SR-55 plays a central role in progressing Orange County’s mobility, economy and quality of life. This section of I-405 provides direct and indirect access to residential communities, employment centers, cultural and recreational facilities, John Wayne Airport, and some of the region’s top medical and academic institutions.
This 8.5 mile segment of I-405 is one of the busiest stretches of freeway in the nation, as well as one of the most congested. Forecasted local and regional traffic demand is expected to increase about 15%, resulting in 255,000 and 291,000 vehicles per day by 2050. To address current and future travel demand on this corridor, OCTA and Caltrans District 12 are studying the I-405 South Improvement Project.
Preferred Alternative
