CHICAGO (WPVI) -- A dispute over a roadway bike lane led to blows on the streets of Chicago.
It started when a bicyclist called out the driver in a white SUV for being in the bike lane.
The GoPro video shows the driver chasing the biker for about a block.
The driver then gets out and attacks the biker, punching him several times in the face.
Chicago detectives are trying to track down the driver.