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Crews are planning to reconstruct the northbound MacArthur Boulevard off-ramp to accommodate the freeway improvements. This work requires a 10-day consecutive closure of the off-ramp. Additional information will be provided in future communications.

Crews continue to remove vegetation and weeds along the project corridor, as well as ensure local streets are maintained for pedestrians and motorists.

Help keep Orange County clean! Please report graffiti and trash along the corridor to the Outreach Team at 888-371-2555 or email SR55Info@octa.net.

The City of Tustin is hosting a series of Concerts in the Park with food trucks, music, and fun for the family! 

Stop by the SR-55 Improvement Project booth on Wednesday, June 19 from 6 to

8 p.m. to learn about construction activities, sign up for project alerts, and pick up one of our project-branded freebies!

Bookmark the closures and detours map for quick access to real-time construction information. Click on the construction icons to view activities and closures.

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. Also, the project will add merge lanes between several interchanges and stripe carpool lanes for continuous access, augmenting safety on the freeway by making merging easier. These enhancements are expected to create a better, smoother driving experience for motorists.