LOS GATOS (CBS SF) — CHP is reporting that all southbound lanes of Highway 17 in Los Gatos were closed Thursday evening after a big rig reportedly hit an overpass.

At 5:39 p.m., CHP reported that there was a severe traffic alert after the accident on southbound Highway 17 north of Highway 9 in Los Gatos.

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The truck is on its side and debris is strewn across the roadway, blocking all southbound lanes. The overpass appeared to be damaged. Rebar was visible, according to the CHP.

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Video from Chopper 5 showed a single line of cars squeezing past the scene of the crash. It appeared that the big rig was transporting a crane that hit the overpass, causing the crash.

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Motorists are advised to expect delays and to use alternate routes to avoid the area. There is no estimated time to reopen the roadway.