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Largest Highway Construction Project in CA Begins

OCTA and Caltrans break ground on the I-405 improvement project, which adds one regular lane in each direction between Euclid St. and I-605, as promised to voters through Measure M.

By Carrie Rossenfeld | Updated on January 29, 2018

405 at Jamboree Traffic on I-405 is anticipated to grow 30% by 2040. ***Photo courtesy of OCTA.

ORANGE COUNTY, CA—The Orange County Transportation Authority, in partnership with Caltrans, has broken ground on the I-405 improvement project, which targets a 16-mile stretch of freeway between Costa Mesa and the Los Angeles County line. The $1.9-billion project will add one regular lane in each direction between Euclid St. and I-605, as promised to voters through Measure M, Orange County’s half-cent sales tax for transportation improvements.

The project also adds a second lane in each direction, which, combined with the existing carpool lanes, will create the 405 express lanes. This is the largest highway project currently under construction in California and the largest in OCTA’s history.

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