He was raceing it in his bimmer and the Golf lost control and crashed into a lamp post / tree / anything else that was nearby and ended up in the middle of the road.
Bascially he slowed down because they where coming up to a roundabout, the Golf then saw this as a chace to get in front, pulled onto the other side, cut infront of him really sharpish because he saw the round about (which I can only asume he didnt know was there) and then just lost it.