A quad is a vehicle whose top is not covered, and with which you can make races. Quad races take rarely place on flat terrain, but more often on rugged slopes, in which drivers must be careful not to drop or loss balance.
In a race quad, the speed and the control of the vehicle are the most important thing. You should finish the race before the others, double them and use the provided bonus when there is some. In quad games, the race can also be timed and you have to do the best possible time.