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A bicycle is a wheeled vehicle primarily propelled by the rider using pedals or hand cranks.

It can be. Electrically assisted bicycles that remain within specified power and assistance-speed limits are commonly treated as bicycles. Faster or more powerful vehicles may be classified differently.

Cyclists should use cycle paths, cycle lanes or the roadway according to the local traffic rules and signs. The required position varies between countries and road types.

This depends on the country and type of cycle facility. Some cycle paths are compulsory, while others are optional.

Yes, when required by local law. Bicycles commonly need a white or yellow light at the front and a red light at the rear during darkness or poor visibility.

Yes. A bicycle used on public roads must have an effective braking system appropriate to its design and local technical requirements.

This varies between countries. Some require helmets for all cyclists or particular age groups, while others recommend helmets without making them compulsory.

Yes, where the bicycle is appropriately equipped and local law permits it. A passenger should use a proper seat and any other required safety equipment.

This depends on local law and the road conditions. Many countries allow two cyclists to ride beside each other in certain circumstances but require single-file riding when necessary for safety or traffic flow.

In many traffic systems, a person who dismounts and walks the bicycle by hand is treated as a pedestrian. The exact legal definition depends on local law.