All lanes have reopened on the Bay Bridge after a four-car collision temporarily closed all of the lanes Saturday evening, according to the California Highway Patrol.
CHP first received reports of a wrong-way driver traveling westbound in the eastbound lanes of the Bay Bridge at 8:27 p.m., according to Off. Daniel Hill.
A few minutes later, at 8:33 p.m., CHP received reports of a multi-vehicle collision near the tower on the east span of the bridge, Hill said.
CHP, along with fire and medical crews arrived to find four vehicles involved in the crash and transported four people to area hospitals with minor injuries, Hill said.
All of the lanes were closed temporarily to allow emergency crews to access the crash site. Hill said a large amount of debris was left on the bridge. Authorities kept some lanes closed while they cleared the roadway.
Hill said the investigation into the incident, including why the person was driving the wrong way on the bridge, is still ongoing.
"Wrong way driving happens more frequently that you would believe on our freeways," Hill said. "Usually, people realize their error pretty quickly. When they don't, a medical condition or impairment by drugs or alcohol is most typically the cause."
Hill said CHP is working with medical personnel to determine if any of those factors were at play in this collision.