The practice of a motorcycle traveling between lanes of slow-moving or stopped traffic is often referred to as lane splitting, lane sharing, or filtering. Typically, this maneuver involves a motorcycle riding in the space between two lanes of traffic moving in the same direction. For example, on a congested freeway, a motorcyclist might ride between the lane markings separating two lanes of stopped or slowly moving cars.
The legality and regulation of this practice vary significantly by jurisdiction. Where permitted, it is often subject to specific restrictions, such as speed limitations relative to the surrounding traffic and prohibitions in certain areas or conditions. Proponents argue that it can improve traffic flow by reducing congestion and increase motorcycle rider safety by allowing them to avoid being rear-ended. The historical context often involves initial acceptance due to the smaller size of motorcycles and evolving regulations reflecting safety concerns and traffic management strategies.
