V C Section 111 All Terrain Vehicle
111. "All-terrain vehicle" means a motor vehicle subject to subdivision (a) of Section 38010 which is all of the following:
(a) Designed for operation off of the highway by an operator with no more than one passenger .
(b) Fifty inches or less in width.
(c) Nine hundred pounds or less unladen weight.
(d) Suspended on three or more low-pressure tires.
(e) Has a single seat designed to be straddled by the operator , or a single seat designed to be straddled by the operator and a seat for no more than one passenger.
(f) Has handlebars for steering control.