After merging onto 92 westbound from 101 southbound, the driver in front of me was cut off by another merging driver, and he had to slam on his brakes. I was unable to stop in time, and hit him. When I hit him, his spare tire fell off the back of his car. The spare tire rolled into traffic and struck another car. Airbags didn't deploy, and the other cars could drive away.
Maps link. I was in the middle of three lanes, going with the flow.