People were probably following them from the previous light and saw them take off. When they finally caught up they probably saw the 2 cars and the accident and said "hey those mofos were just racing".
Then when the cop gets there and says "omg wtf happened here?" then the other witnesses say "these mofos were racing...". Then the cop says to the honda owner "your car is a piece of shit, and you were racing with it, now it belong to us".
*IMPOUNDED*