Motorcycles are one of the most affordable two-wheeler vehicles in many parts of the world and, for most of the world's population.  They are also the most common type of motor vehicle. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, for congested urban traffic, cruising, sport and racing. Most of the motorcycles, 58%, are in the developing countries of Asia. Motorcycles are propelled by petrol only.