This article was originally published in Forward Motion, March 2026, a quarterly publication of Mobility 21
A year after breaking ground on the SR-91 Improvement Project, significant progress is being made on construction along one of Orange County’s busiest freeways for people traveling to and through Anaheim, Fullerton, Orange, Placentia and Yorba Linda.
The $779 million project, led by the Orange County Transportation Authority in partnership with Caltrans, is funded by OCTA’s Measure M half-cent sales tax program, reinvested toll revenue from those who use the 91 Express Lanes, and state and federal funds.
The project is broken into three construction segments stretching approximately between SR-57 and SR-55. In the segment at the SR-91/Lakeview Avenue interchange, crews recently put into place a new traffic configuration that helps enhance safety, reduce merging conflicts and improve access between SR-91 and SR-55.
New Westbound SR-91 On-Ramp at Lakeview Avenue
As of early March, the existing westbound SR-91 loop on-ramp at Lakeview Avenue was permanently closed. Now, drivers traveling northbound and southbound on Lakeview Avenue use a new temporary signalized intersection to access the westbound SR-91 straight on-ramp. Northbound drivers will turn left at the signal to access the on-ramp, while southbound drivers will turn right at the signal.
In addition, the eastern side of the Lakeview Avenue bridge will be closed to pedestrians through August 2026. The western sidewalk remains open.
Overall, the SR-91 Improvement Project is enhancing 6.6 miles of SR-91 through Anaheim, Fullerton, Orange, Placentia and Yorba Linda. Up to 321,000 vehicles travel this stretch daily, and that number is expected to grow.
The project, which broke ground in early March 2025, is designed to reduce congestion and improve travel times, improve freeway interchange connections, and reduce weaving and merging.
The project will also reconstruct key overcrossings with enhanced safety features and amenities for pedestrians and cyclists. The improvements are expected to be completed by 2030.
For more information and to sign up for project updates, visit octa.net/91improvements.