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June 15 2025 Vol. VI • No. 12
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Orange County SR 55 Improvement Moves Forward
Roadbed construction is under way on the northbound Dyer Road off-ramp, assisted with heavy equipment that includes a Cat 328D excavator.
Keri White CEG CORRESPONDENT
Workers oversee one of many expected concrete pours.
The Costa Mesa Freeway (State Route 55) is undergoing a significant upgrade to improve traffic flow and reduce travel time in the 4 mi. stretch between Interstate 405 and Interstate 5. The roadway has four regular lanes and one carpool lane in each direction as well as merge lanes between some interchanges. The upgrade being led by contractor Security Paving Co. Inc. of Westlake Village, Calif., integrates an additional regular lane and an additional carpool lane in each direction. The project also will add merge lanes on northbound SR 55 between the interchanges at MacArthur Boulevard, Dyer Road and Edinger Avenue to facilitate merging and improve roadway safety. The improvements are intended to help increase access to
job centers, health care facilities, educational institutions and John Wayne Airport, as well as other important destinations in and around the region. The cities along this high-traffic corridor include Irvine, Santa Ana and Tustin, and the project timeline began in August of 2022 and runs through 2027. The freeway is one of the most heavily traveled roads in Southern California; it serves as a critical connector to other major arteries and is the only north-south freeway linking Central Orange County to the coast. About 260,000 vehicles travel the road daily, and that number is expected to reach 275,000 by 2040. The commercial trucking industry also will benefit from the project; the road accommodates 17,000 daily trucking trips. The added lanes will reduce travel time, saving up to 1,500 hours per day. This will improve air quality; fewer trucking hours on the road will reduce exhaust and pollution output. see SR55 page 6