Motorcyclist dies after chain-reaction crashes on San Francisco freeway

Two drivers were arrested Tuesday morning on suspicion of DUI after a motorcyclist was killed while being ejected from his bike and falling over a freeway ramp.  

The motorcyclist was described as a white man in his 30s. 

The victim's death came during a series of calamities on the US-101 southbound to I-80 eastbound elevated connector ramp about 3:30 a.m., according to the California Highway Patrol.

The string of events began when the driver of a Nissan sedan was stopped in that area, blocking a lane of traffic.

A motorcyclist lost control while trying to avoid the disabled Nissan, the CHP said. 

"My assumption is he swerved to the right and collided with the wall on the right, which then caused him to be thrown over the wall on the right side," said CHP Officer Mark Andrews.

The biker fell about 40 feet down to another connector.

At that time, a Honda sedan was traveling on I-80 westbound to the US-101 southbound connector ramp, the CHP said. 

The motorcyclist fell on top of the Honda, landed on its roof and then rolled to the freeway, prompting that driver to stop, the CHP said. 

Just then, the CHP said the driver of a Subaru Forester approached the back of the Honda, slamming into the back of it. 

The motorcyclist was possibly struck by more than one car and was pronounced dead at the scene, Andrews said.

The drivers of the Nissan and Subaru were both arrested and booked on suspicion of driving under the influence. 

The driver of the Honda was not arrested and sustained minor injuries, the CHP said. 

Any witnesses should contact Officer Israel Garcia at the CHP San Francisco Area office at (415) 557-1094.