Definitions.

As used in the Motor Vehicle Code: A. "bicycle" means every device propelled by human power upon which any person may ride, having two tandem wheels, except scooters and similar devices; B. "bureau" means the traffic safety bureau of the department of transportation; C. "bus" means every motor vehicle designed and used for the transportation of persons and every motor vehicle, other than a taxicab, designed and used for the transportation of persons for compensation; and D. "business district" means the territory contiguous to and including a highway when within any three hundred feet along the highway there are buildings in use for business or industrial purposes, including but not limited to hotels, banks or office buildings, railroad stations and public buildings that occupy at least fifty percent of the frontage on one side or fifty percent of the frontage collectively on both sides of the highway.