At intersections, red, yellow, and green traffic lights hang on all four sides, serving as silent "traffic police." Traffic lights are internationally standardisignals. Red means stop, and green means go. At intersections, vehicles from various directions converge here; some intend to go straight, while others intend to turn. To determine wh goes first, one must follow the direction of the traffic lights. When the red light is on, going straight or turning left is prohibited; vehicles are allowed to turn right if it does pedestrians or other vehicles. When the green light is on, vehicles are permitted to go straight or turn. When the yellow light is on, vehicles must stop behind the stop line oian crossing; those already in the intersection may continue. When the yellow light flashes, it warns vehicles to pay attention to safety.
