A stretch of southbound Interstate 280 in San Francisco is closed until Tuesday morning to allow crews to replace a hinge on the road, according to Caltrans officials.
Southbound Interstate 280 will be closing at 9 p.m. between downtown San Francisco and the Pennsylvania Avenue on-ramp. The road is expected to reopen by 5 a.m. Tuesday.
The southbound closure affects the Mariposa Street/18th Street, Sixth Street/Brannan, and King Street on-ramps.
Northbound lanes will remain open during the closure.
Overhead signs on roads throughout the region are displaying closure information and dates.
Highway 101 is expected to be heavily used as a detour this weekend.
Later this year, northbound lanes will be closed on the Fourth of July holiday weekend starting July 3 and over the Labor Day holiday weekend starting on Aug. 28.
The closures will allow work on three bridge hinges on the road.
Hinges connect two parts of a bridge and allow for expansion and contraction on both sides of the road, as well as for movement during an earthquake, according to Caltrans.
Crews will be demolishing concrete around old bridge hinges, removing it and installing a new hinge.
More information about the closures is available at www.dot.ca.gov/dist4/projects/280Bridge.