Do the DUI laws only apply to driving an automobile on a public highway?
Driving while under the influence is generally prohibited whenever you drive any kind of vehicle. For purposes of the principal DUI statutes, a “vehicle” is defined as: “A device by which any person or property may be propelled, or drawn upon a highway, except a device moved exclusively by human power or used exclusively upon stationary rails or tracks.” Vehicle Code ยง 670. That would include all motorized vehicles. Does that mean you are safe driving a human-powered bicycle while intoxicated? Not in California. Vehicle Code section 21200 specifically states it is unlawful to ride a bike under the influence. Furthermore, California courts have interpreted the DUI laws to apply even when the driver is driving on a private road instead of a highway.
