The ATV is the fastest off-road vehicle in the game. It's also one of the fastest ground vehicles on the road. Currently, there are seven known spawn locations for the ATV.
ATV's are one of the easiest vehicles to flip, so extra caution when driving fast is advisable, especially on rough or mountainous terrain. If it does flip, it's possible to get it upright again either by gently bumping it with another vehicle, or sometimes by turning the wheels the right way while working the throttle. As of 18.104.22.168 it can now be unflipped by the player.
To fully repair an ATV, the following parts are required: