Any mechanically or electrically powered device not operated on rails, upon which or by which any person or property may be transported upon a land highway. The load on a motor vehicle or trailer attached to it is considered part of the vehicle. Tractors and motorized machinery are included while self-propelled in transit or used for transportation. Non-motor vehicle is any road vehicle other than a motor vehicle, such as a bicycle or animal-drawn vehicle. Coaster wagon, child’s sled, child’s tricycle, child’s carriage and similar means of transportation are not included; persons using these are considered pedestrians.