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In observance of Labor Day, there will be no closures scheduled Friday, Aug. 30 through Monday, Sept. 2. Construction activities will resume on Tuesday, Sept. 3.

As crews continue to make progress constructing the new retaining wall along the southbound MacArthur Boulevard

on-ramp, an additional overnight concrete pour is planned as early as midnight to

5 a.m. on Friday, Sept. 6.

This work will require closing the southbound MacArthur Boulevard straight and loop on-ramps, as well as one outside lane on southbound SR-55 at MacArthur. Click here to view the detour map. 

The Tustin Police Department is hosting its 27th Annual Open House event on Saturday, Sept. 7 from 11 a.m. to 3 p.m. Come enjoy live demonstrations, free hot dog lunches and shaved ice desserts along with several fun activities for your little ones! 

Be sure to stop by the SR-55 Improvement Project booth 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.