All lanes on the westbound side of the Riverside (91) Freeway between the Corona (71) Expressway and Highway 241 in Anaheim Hills are slated to be shut down Friday evening to facilitate work on overhead signage.

According to the Riverside County Transportation Commission, the roughly 2-mile-long closure is scheduled to begin about 11 p.m. and continue until 5 a.m. Saturday.

In addition to shutting down traffic lanes, crews will be closing the entire southbound 71 connector to the westbound 91, the northbound Interstate 15 connector to the two westbound Express Lanes on the 91, and the Green River Road exit and entrance ramps to the westbound 91, RCTC said.

Detours will be available, and maps can be found at

Officials said that the closures are part of the remaining elements of the $29 million “91 Corridor Operations Project,” which began in November 2020. Along with erecting overhead signs, crews will also be re-striping lanes.

The project has entailed adding a new westbound general purpose lane to reduce congestion between the 71 interchange and the 241 toll road. The newly constructed lane will be open briefly Friday morning for motorists to use.

Lane closures are scheduled throughout this month, weather permitting, on the westbound 91 as part of the project, according to RCTC.

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