SAN FRANCISCO—One lane on the Golden Gate Bridge will be closed to drivers as crews repair the bridge’s “zipper” movable barrier on Tuesday, January 3.

The movable barrier allows the Golden Gate Bridge Highway and Transportation District to adjust the street lanes on the bridge to create four separate lanes to accommodate for the morning and evening commutes into and out of San Francisco.

Around 1:30 p.m. on Monday, January 2 crews discovered a section of the barrier was broken during a move, indicated the Golden Gate Bridge, Highway and Transportation District.

The barrier is out of alignment and not able to move.

“One of the barrier units has a broken section. If we use the machine to change the lane configuration, it could break [or] make the situation worse,” said spokeswoman Priya Clemens.

Tuesday morning’s traffic may be heavily impacted by the repairs as crews work to fix the broken barrier, said Clemens.

The bridge will only have three southbound lanes and three northbound lanes for Tuesday morning’s commute. Traffic congestion is expected for motorists.

Engineers and bridge patrol does not know how the barrier was damaged, but are expected to have the barrier fixed by midday, said Clemens.