Three wheeler

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Daihatsu Midget three-wheeled commercial vehicles

A three wheeler is a vehicle with three wheels, either "people-powered vehicles" (PPV) or motorized vehicles in the form of a motorcycle, ATV or automobile. Other names for three-wheelers include Trikes, Tricars and Cyclecars. The term tricyle is used somewhat interchangeably, but the term three-wheeler is more often applied to motor vehicles.

Many three-wheelers which exist in the form of motorcycle-based machines are often called trikes and often have the front single wheel and mechanics similar to that of a motorcycle and the rear axle similar to that of a car. Often such vehicles are owner–constructed using a portion of a rear–engine, rear–drive Volkswagen "Beetle" in combination with a motorcycle front end. Other trikes include "All Terrain Vehicles" (ATV) that are specially constructed for off road use. Three-wheeled automobiles can have either one wheel at the back and two at the front, (for example: Morgan Motor Company) or one wheel at the front and two at the back (for example: Reliant).

Three-wheeler cars, usually microcars, are often built for economy reasons, or as was the case in the UK, to take advantage of tax advantages, or as in the US to take advantage of the lower safety regulations, there being classed as motorcycles. As a result of their light construction and often relaxed pollution reqirements, leading to higher efficiency, three-wheeled cars are usually very economical to run.

A company ZAP manufactures an electric three wheeled all electric car known as the Xebra

[edit] Safety

When the single wheel is in the front (the "delta" form, as in a child's pedal tricycle), the vehicle is inherently unstable in a braking turn, as the combined tipping forces at the center of gravity from turning and braking can rapidly extend beyond the triangle formed by the contact patches of the wheels. This type, if not tipped, also has a greater tendency to spin out ("swap ends") when handled roughly. As with any vehicle, it is only as safe as the rider.

With two wheels in the front (the "tadpole" form) the vehicle is far more stable in braking turns, but remains more prone to overturning in normal turns compared to an equivalent four–wheeled vehicle.

Due to the incidence of injuries related to their use, a 10-year ban was placed on the sale of new three-wheeled ATVs in the United States in January of 1988.