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Crews will be removing and pouring concrete to reconstruct the northbound SR-55 MacArthur Boulevard straight on-ramp, which will require an extended closure of the ramp. The on-ramp is expected to close as soon as 8 p.m. tonight, Feb. 28 and reopen to motorists by 5 a.m. on Monday, March 10.

In addition, crews are expected to replace the pavement of the outside lane on northbound SR-55 between MacArthur Boulevard and Dyer Road. This work will require an extended closure of the outside lane, from 10 p.m. Friday, March 7 to 5 a.m. Monday, March 10.

As part of the freeway improvements, crews are in the process of installing various overhead sign structures throughout the corridor. These structures will be placed along the shoulders of the freeway, as well as in the median.

By the end of the project, a total of 38 new sign structures and 4 bridge mounted sign structures will be installed.

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.