SAN FRANCISCO (KRON) — A fatal accident that left two people dead and a person experiencing mental issues led to a massive traffic backup on the Bay Bridge Thursday morning.

The CHP received a call at about 11:20 p.m. of a collision between a big-rig and a black Dodge Charger. The Dodge was speeding before it hit the big-rig traveling at 15 mph, CHP Officer Erica Tatum said. The Dodge hit the rear of the truck, killing the two people inside the Dodge, Tatum said.

Five lanes of the freeway were shut down for about four hours while officers investigated.

As an alternate route, take the Richmond-San Rafael Bridge to the Golden Gate Bridge, the San Mateo Bridge, BART or the ferry to get into San Francisco.

Earlier, around 10 p.m. Wednesday, someone climbed on to the railing of the Bay Bridge.

CHP responded to the scene and said the person was on the westbound lanes just east of the center anchorage. Crews were able to safely remove the person around 6:26 a.m. Thursday and take them into custody.

About an hour later around 11:15 p.m. Wednesday, CHP said there was a three-vehicle collision on the westbound incline with those involved suffering minor injuries

As of 7 a.m., CHP reported that all westbound lanes on the Bay Bridge have been reopened. Expect residual delays.