TREASURE ISLAND (CBS SF) — A four-car crash on westbound I-80 past Treasure Island snarled traffic Monday afternoon, closing four lanes of the Bay Bridge for about an hour, authorities said.

CHP said the crash happened shortly before 2 p.m. A black sedan reportedly driving at high rate of speed collided with four to five other vehicles. The crash initially blocked lanes 2-5.

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CHP said the collision west of Treasure Island Road in San Francisco had closed the right and center lanes.

The San Francisco Fire Department also responded to the crash and confirmed that four vehicles were involved and four westbound lanes were shut down.

KPIX 5 reporter Andria Borba was among those stuck in the traffic jam coming into San Francisco.

While the accident was cleared and all lanes were reopened by 2:50 p.m., traffic cameras at the metering lights showed there was still a significant back-up of cars crawling across the span.

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By 3 p.m., traffic started to pick up. Motorists are advised to expect delays and to use alternate routes to avoid the area.