According to the California Highway Patrol, the incident happened at around 2:30 p.m. on 80 Freeway at Treasure Island Road,

San Francisco, CA – A motorcyclist was killed in a crash on Interstate 80 in San Francisco Friday afternoon.
According to the California Highway Patrol, the incident happened at around 2:30 p.m. on 80 Freeway at Treasure Island Road,
A Toyota Corolla collided with the motorcycle in the area in unclear circumstances.
The rider was ejected and was struck by another vehicle that fled the scene.
The driver of the Corolla remained at the crash site and cooperated with the officers.
The highway was impacted for several hours.
The identity of the deceased was not immediately disclosed.
No further details regarding the collision were available.
An investigation is underway.