The Point: The 91 Corridor Operations Project will require nighttime closure of all westbound 91 lanes Friday night, following “soft opening” later this week.

Westbound 91 in Corona will be busy this weekend as RCTC prepares to open a new lane during the day on Friday and close all westbound lanes Friday night to install an overhead sign. Once the overhead sign is placed, all lanes will reopen, including the new lane built for the 91 Corridor Operations Project.

The closure will include all lanes on westbound 91 between the 71 and the 241 Toll Road, Friday night, at 11 p.m. to Saturday morning at 5 a.m. Crews will use the closure to safely install an overhead sign across the lanes, one of the last pieces of work on the project.

To support the closure, the westbound 91 Express Lanes in Riverside and Orange counties, the westbound Green River Road on-ramp and off-ramp, the southbound 71/westbound 91 connector, and the northbound 15/westbound 91 Express Lanes connector will be closed starting as early as 8 p.m. If possible, avoid the area or follow the detour route north on the 71, west on the 60, and south on the 57 to access westbound 91 in Orange County. See map

Construction activity may change due to weather or other factors. If work cannot be performed on January 7, it will be rescheduled for the next possible date.

RCTC is expected to open the new westbound 91 lane later this week for commuters to give it a spin before the full lane closures begin Friday night. Expect nighttime lane closures this week to allow crews to restripe the lanes and remove barriers. See closure details.

Construction of the new two-mile, non-tolled lane began in November 2020. The lane is designed to help relieve traffic congestion, especially during heavy morning commute hours.

Partners for the $29 million investment include the Orange County Transportation Authority, Caltrans, the Transportation Corridor Agencies, and the City of Corona. RCTC used strategic project staging and offered financial incentives to the contractor to complete the project quickly and to reduce the effects on motorists and neighbors.

To learn more about 91 Corridor Operations Projects, visit