Of all the Orange County Roads & Highways Projects, the $1.9 billion I-405 Improvement Project is the largest. In fact, it is the largest highway project under construction in California and the second largest in state history. The I-405 is an essential artery in the region and this 16-mile segment in Orange County is one of the most heavily traveled stretches of highway in the nation, used by more than 370,000 vehicles a day.
The I-5 freeway expansion project is a step toward improving traffic flow and safety. This Orange County infrastructure project will add one regular lane in each direction between Euclid Street and I-605, and a second lane in each direction in the center of the freeway from SR-73 to I-605 that will combine with the existing carpool lanes to form the 405 Express Lanes, which have been modeled after OCTA’s 91 Express Lanes.