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A two-wheeler is a vehicle that runs on two wheels.
The two wheels may be arranged in tandem, one behind the other, as with single-track vehicles, or arranged and also side by side, on the same axle. If on the same axle, the vehicle may have no other support, as with dicycles, or have additional support, which is often also the source of motive power.
Wheeled single-track vehicles include:
Dicycles include:

Two-wheelers intended to be used with additional support, which is also the source of motive power, include:
Two-wheelers intended to be used with additional support, which is not the source of motive power, include:
In 2022, the World Health Organization reported that nearly 30% of road crash deaths worldwide involve powered two- and three-wheeled vehicles such as motorcycles, mopeds, scooters and e-bikes, and that these deaths are increasing. In the WHO South-East Asia Region, such vehicles are involved in 43% of all road traffic deaths.