The 91 Freeway in Corona reopened early Monday following a full closure over the weekend.
All westbound and eastbound lanes along a six-mile stretch between Interstate 15 and the 71 reopened by 3:30 a.m., according to the Riverside County Transportation Commission.
The freeway had been closed since Friday night as crews repaved some roads and tore down most of a bridge as part of a $1.4 billion expansion.
Eliza Perez with the transportation commission compared the process to the "Slow Jam" earlier this month in Los Angeles. That project involved closing part of the 101 to tear down the Sixth Street Bridge.
"They had never closed that portion of the freeway, and similar here, this project has been under construction for nearly two years, and we have not had a full closure during any peak time hours," Perez said.
Traffic was lighter than expected both near the closure area and along the recommended detours, according to the commission.
"The 91 Steer Clear was an incredible success. The way to approach a complex operation like this is to plan the work, and work the plan – and that's exactly what we did," RCTC Executive Director Anne Mayer said in a prepared statement.
Intermittent nighttime closures of select lanes on the 91 near Maple Street may be required, but the commission said crews made enough progress over the weekend that full nighttime closures will not be needed.