Houhai Avenue goes north and crosses Hyde Road. Why does the second traffic light have two floors?

Due to the huge number of vehicles, in order to reduce the probability of traffic accidents, two traffic lights are set up to control vehicles in different lanes to change lanes left and right. When the vehicle is in the auxiliary lane, if the right green light is on and the left red light is on, the vehicle in the auxiliary lane can change lanes to the main lane; If the left green light is on and the right red light is on, vehicles in the main lane can change lanes to the right auxiliary lane. Double red lights can turn right, but generally turning right is not affected by traffic lights. However, you can turn right according to the relevant concession regulations: 1, when the right-turn arrow light flashes yellow; 2. There is no right-turn arrow light, except when the motor vehicle signal light (that is, the round light) or the straight arrow is red, unless the right-turn prohibition sign is set at the intersection; 3. If there is a light that specifically indicates the right turn direction, you should follow the instructions of the traffic lights, and sometimes there will be a special sign on it; 4. If there is a right-turn lane at the intersection and there is no right-turn lane signal light control, the right-turn of vehicles at the intersection is not controlled by the signal light, but attention must be paid to avoid pedestrians. When changing lanes and turning into main roads, we must follow the principle of "through vehicles first". . When driving, you must pay attention to the signs, signs and traffic lights at the intersection. No matter how many traffic lights there are at an intersection, one of them is a red light, which has nothing to do with other traffic lights. The red light stops, the green light goes, and wait until the yellow light comes on. Sometimes, the traffic lights will be broken. After all, the traffic light is just a machine, and it will always break down all the year round. At this time, you can wait for one more traffic light to observe clearly, so as to avoid violating the rules by running a red light.