State Route 55 (SR 55) is an 18-mile (30-km) long north–south state highway that passes through suburban Orange County in the U.S. state of California. The portion of the route built to freeway standards is known as the Costa Mesa Freeway (formerly the Newport Freeway).

OCTA, in cooperation with Caltrans, is improving 4 miles of SR-55 between I-405 and I-5. The project will improve traffic flow and reduce travel time by adding one regular lane and one carpool lane in each direction.

SR-55 is a vital north-south freeway that links central Orange County and beyond to the coastal region. More than 260,000 vehicles use this stretch of SR-55 every day, and that number is expected to grow to nearly 275,000 vehicles by 2040.

The State Route 55 (SR-55) Multi-Asset Project has combined a multi-asset project and a safety project. The roadway improvement includes pavement rehabilitation; improved drainage, lighting and conduits; bridge rail rehabilitation; landscape; Treatment BMP; solar system technology; and overhead sign panels and overhead sign structures.

Apr 23, 2024 · The Orange County Transportation Authority and Caltrans are improving 4 miles of SR-55 between I-5 to I-405. The project will improve traffic flow and reduce travel time by adding one regular lane and one carpool lane in each direction.

The Costa Mesa Freeway (SR-55) is one of the most heavily congested freeways in Southern California, with more than 260,000 vehicles traveling on it every day. By 2040, that volume is expected to grow to more than 275,000 vehicles per day. SR-55 is a vital link to major freeway systems in Orange County, and the

3 days ago · Highway SR-55 Traffic & Road Conditions in California, CalTrans lane closures and SIG Alerts

Aug 2, 2022 · ORANGE – State, federal and local officials gathered today to mark the start of construction on the SR-55 Improvement Project, which is intended to help improve travel times in central Orange County along one of the most heavily congested freeways in Southern California.

sr 55 [IN THE SOUTHERN CALIFORNIA AREA] The northbound & southbound connectors to northbound & southbound SR 55 /in Costa Mesa/ (Orange Co) are closed from 1900 hrs each night to 0500 hrs each morning Tuesday thru Friday thru 4/19/25 - Due to construction - …

Orange County Transportation Authority (OCTA) is proposing to improve freight access and throughput on the State Route 55 (SR-55) from Interstate 405 (I-405) to Interstate 5 (I-5) to enhance mobility for the traveling public.