Road rage nightmare crash footage

https://www.youtube.com/watch?v=139JYhMiYLc

A motorist was left with a "gash to the head" after crashing on a California highway, reports the BBC. In the video, posted courtesy of Chris Traber, a motorcyclist veers close to a car and kicks it. The car then swerves, though it's not clear if the driver was retaliating or panicking. Then the car strikes the center divide and all hell breaks loose.