Every person riding a bicycle on a roadway is granted all the right and is subject to all the responsibilities that apply to operators of a vehicle. Motorists must leave at least three feet of clearance when passing a bicycle. Bicyclists must leave at least three feet of clearance when passing other vehicles.  Bicyclists must use hand signals when turning or stopping unless both hands are needed to control the bicycle. Bicyclists should ride as near as they safely can to the right edge of the roadway, unless preparing to make a left turn. On one-way streets bicyclists may ride as close as possible to the right or left edge of the roadway.

Bicyclists may not ride more than two abreast on a roadway. Bicyclists must have a white light visible from at least 500 feet in front of the bike and a red reflector at least two inches in diameter visible from at least 500 feet to the rear when riding at night. Bicycles must be equipped with brakes in good working order. 

Also see the Bicycle Federation of Wisconsin page for additional details.