Orange County Roads & Highways Projects

Ensuring mobility while increasing safety

Roads & Highways2023-08-24T12:56:19-07:00

Increasing Safety, Meeting Standards

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.

This project also includes replacing bridges that do not meet height or weight standards. The first of 18 bridges to be built, widened or replaced as part of the I-405 Improvement Project was the Slater Avenue Bridge in Fountain Valley. It was fully demolished in September 2019 and successfully reconstructed in less than a year.

The I-405 Improvement Project is expected to be completed in 2023 and it is being funded by a combination of local, state and federal funds — including $1.1 million from Orange County’s Measure M2, a half-cent sales tax for transportation improvements.

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