The left-turn lane can only turn left, and the straight lane can only go straight.

Lane refers to the part of the road where single-row vehicles can travel. According to the relevant standards promulgated by the state, it is almost the same as the common standards in the world. The width of each lane of urban roads is 3.5 meters, the width of each lane of intersection branches is 2.3-2.5 meters, the width of each lane of trunk highways (including expressways) is 3 meters, and the shoulder (expressway emergency parking zone) 1.5-2.5 meters. The width of each lane of the expressway toll station is 2.5 meters, and an extra-wide toll lane of 3.5 meters or more must be set when necessary.