Seattle has bus priority at multiple intersections and it does not cause problems. At those intersections busses arrive at the curb lane to pickup/dropoff. The

Seattle has bus priority at multiple intersections and it does not cause problems. At those intersections busses arrive at the curb lane to pickup/dropoff. Then a special light tells the bus driver that it is ok to proceed into the intersection, while all other cars have a red signal. The bus pulls out and leapfrogs traffic.