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Crews are nearing the finish line reconstructing the southbound McFadden Avenue on- and off-ramps, which require extended closures of each ramp. We thank and appreciate the public for allowing crews to complete the work safely and keep the project moving forward.

The ramps are expected to reopen to motorists by 9 p.m., tonight, Friday, June 5.

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

Construction crews are expected to reconstruct the southbound Dyer Road loop off-ramp, which will require an extended closure of the ramp. Additional information will be provided in future communications.

Don't miss the 42nd Annual Tustin Street Fair and Chili Cook-Off on Sunday, June 7 from 11 a.m. to 6 p.m. in Old Town Tustin.

Stop by the SR-55 Improvement Project booth to learn about upcoming 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.