Motorcycles are motor vehicles that have two wheels and can be steered by the rider using a handlebar-mounted controls. Powered by a gasoline or electric engine, they can be designed to carry one or more passengers. The motorcycle is a form of personal transportation that offers an exhilarating and economical way to get around. It is a popular mode of transportation in the developing world, especially in cities where traffic congestion and air pollution are significant problems.
The design of a motorcycle is different from that of a car or even a bicycle. The main difference is the use of the engine to provide power to the rear wheel. This is accomplished by connecting a drive chain to the crankshaft and to the back sprocket on the rear wheel, while controlling the transmission through the clutch and throttle. Most modern motorcycles also have a braking system, usually of the disc type, and are started by means of an electric push-button starter.
Many small motorcycles have a single front brake, while larger models typically have dual rotors on the front to maximize stopping power. This is particularly important because the majority of multi-vehicle motorcycle crashes are caused when drivers of other vehicles fail to see the biker.
As with any vehicle, there are rules that must be followed while riding a motorcycle. Aside from the obvious safety issues, riders must obey all traffic laws and ride within the speed limit. In addition, it is recommended that all motorcycle riders wear protective clothing to minimize the risk of road rash, burns and abrasions.