(KRON) -- A crash on the northbound lanes of Highway 101 in Redwood City is blocking four lanes of traffic, according to the California Highway Patrol. The crash occurred Thursday afternoon near North Shoreline Boulevard. New SF mayor announces citywide hiring freeze on first full day in office A photo posted by the CHP appeared to show the crash involved an SUV and another vehicle, and possibly, a larger truck. There is no estimated time for the lanes to reopen. Drivers are advised to expect delays. This is a developing story. Check back for updates.