Lane group is a set of lanes established at an intersection approach for separate capacity and level-of-service analysis. Lane groups are defined by one or more lanes that accommodate traffic with a common stop-line and a capacity that is shared by all vehicles. As a result, all exclusive turn lanes are treated as separate lane groups. Through lanes are also generally grouped together, including through lanes that allow for shared right and/or left turn movements, unless one of the shared turn lanes acts as a de facto turn lane.