Generally, the sign of speed limit 20 rarely appears, indicating that the road condition is not good or traffic accidents are prone to occur. There is also a no-go in your photo, which also shows that this section is more dangerous. This is a traffic accident-prone area and should be monitored. If you run more than 22 miles, you will definitely be photographed. This speed limit sign will also be set up on some temporary inspection sections. You should pay attention. And this sign is regardless of the model, as long as it is a motor vehicle.