Can the factory speed limit sign be posted on the wall?

The factory speed limit sign can be posted on the wall. According to the Road Traffic Safety Law and related standards, speed limit signs should be set in places where vehicles can see and have obvious warning functions. There is an area in the factory that needs speed limit management, and signs are set in this area to ensure that the signs meet the requirements of relevant standards. In addition, it is acceptable to stick the sign on the wall to ensure that the sign is obvious and easy for the driver to see.