There is no law that requires bicyclists to use a bike lane. Bicyclists may need to use adjacent lanes to pass another bicyclist, to avoid being too close to parked cars (if opening car doors could obstruct their path), to avoid obstructions or slippery conditions, or to prepare for a turn. Whenever bicyclists enter or exit a bike lane or side path, they should signal and yield to motorists already in an adjacent travel lane.
Motorists may not drive, park, stop, stand or load a vehicle in a bike lane, except when posted signs permit. Whenever a bicycle lane has been established on a roadway, any person operating a motor vehicle on such roadway shall not drive in the bicycle lane except to perform parking maneuvers in order to park where parking is permitted, to enter or leave the highway, or to prepare for a turn (MN 169.19, Subdivision 1; MN 169.34, Subdivision 1).