As used in and for the purpose of this article, certain words and phrases shall have the meanings herein indicated:
All vehicles of the Fire Department, Police Department and Beach Patrol, ambulances, other City vehicles and such other vehicles as are approved by the Chief of Police and operated in response to an emergency call.
Such vehicles as are approved by the Chief of Police and operated for some special occasion or purpose.
An automobile, bicycle, motor bike, motor tricycle, motor scooter, motorcycle, tricycle, omnibus, taxi or rolling chair, including any motorized rolling chair, truck, trackless train, tractor or trailer.