A crash involving a big rig on U.S. Highway 101 near South San Francisco caused a fuel spill and knocked out power to Caltrain overhead lines, authorities said.

A truck crash on Highway 101 early Thursday morning brought down power lines and spilled 160 gallons of fuel, causing major delays for Caltrain service between San Francisco and South San Francisco. The crash occurred around 5 a.

Motorists planning to travel on southbound Highway 101 between South San Francisco and San Bruno were advised to expect delays after a crash Thursday morning closed multiple lanes. An 18-wheeler struck the bridge railing along the right shoulder of the highway just before 5 a.