SAN FRANCISCO (CBS SF) — A multi-vehicle crash that was blocking four lanes on the upper deck of the Bay Bridge Wednesday afternoon has been cleared, according to the California Highway Patrol.

A Sigalert was issued shortly after 5 p.m., and was lifted at about 5:35 p.m.

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According to the CHP, the crash happened just west of the Center Anchorage and resulted in an overturned vehicle, blocking lanes 1, 2, 3 and 5. Only lane 4 was open.

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The driver of the overturned vehicle managed to climb out and was not injured.

Fire and emergency crews were on the scene.

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There is no word as to what caused the accident.