Please write a summary of the kinds of vehicles that are used for ambulances.
The most common types of vehicle used as an ambulance are cars, vans or pickup trucks. Depending on many factors, such as accessibility to the patient and/or medical services or the urgency of treatment, other types of vehicles are used as well, including: bicycles, all-terrain vehicles, golf carts, helicopters, fixed-wing aircraft, boats, busses, trailers, horse and cart, and fire engines.