Whenever used in this chapter, the following terms shall be defined as indicated herein:

(1) "Motor vehicle" shall mean any self-propelled device capable of being moved upon a road, and in, upon, or by which any persons or property may be transported or drawn, and shall include, but not be limited to, automobiles, trucks, motorcycles, motorbikes, motor scooters, jeeps, or similar type 4-wheel drive vehicles, and snowmobiles, whether or not they can legally be operated upon the public highways.

(2) "Trail" shall mean any path or track designed for use of pedestrians or equestrians and which is not of sufficient width, nor graded or paved with concrete, asphalt, gravel, or similar substance, so as to permit its use by standard passenger automobiles; or any other right of way specifically designated and posted for nonvehicular use.