An ATV is described with a frame and at least three wheels suspended from the frame. At least one of the wheels is a front wheel and at least one of the wheels is a rear wheel. The front wheel defines a front axis and the rear wheel defines a rear axis. A power unit drives at least one of the wheels on the frame. A straddle-type seat is provided with a main seat portion for a driver and a secondary seat portion, rearward of the main portion, for a passenger. A back rest is also provided for the secondary seat portion, the back rest having a back-supporting front surface positioned in front of the rear axis. At least one of the wheels is steered by a steering member.