Is there a traffic law that trucks drive on the right?

There is no clear and unified regulation. It depends on the regulations of various provinces and cities. According to the traffic law, motor vehicles and non-motor vehicles are allowed to pass on the right. If there are more than two motor vehicle lanes in the same direction, the left lane is the fast lane, and the right lane is the slow lane. If the speed is fast, you should drive in the fast lane, and if the speed is slow, you should drive in the slow lane (if the speed cannot reach the speed specified in the fast lane).

According to the Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China,

Article 44 Where there are more than two motor vehicle lanes in the same direction, the left side is the fast lane and the right side is the slow lane. Motor vehicles driving in the fast lane should drive at the speed specified in the fast lane. If the speed specified in the fast lane is not reached, they should drive in the slow lane. Motorcycles should drive in the rightmost lane.

if there are traffic signs indicating the driving speed, drive according to the indicated driving speed. When a motor vehicle in the slow lane overtakes the preceding vehicle, it can borrow the fast lane to drive. If there are more than two motor vehicle lanes in the same direction on the road, the motor vehicles changing lanes shall not affect the normal driving of the motor vehicles driving in the relevant lanes.

Extended information

Road Traffic Safety Law of the People's Republic of China

Article 35 Motor vehicles and non-motor vehicles shall drive on the right.

article 36 according to road conditions and traffic needs, roads are divided into motor vehicle lanes, non-motor vehicle lanes and sidewalks, and motor vehicles, non-motor vehicles and pedestrians are allowed to pass in separate lanes. Without dividing motor vehicle lanes, non-motor vehicle lanes and sidewalks, motor vehicles pass in the middle of the road, and non-motor vehicles and pedestrians pass on both sides of the road.

Article 37 Where a special lane is designated on a road, only the specified vehicles are allowed to pass in the special lane, and other vehicles are not allowed to drive in the special lane.

Public Security Traffic Management Bureau of Beijing Public Security Bureau-Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China