What are the general specifications of common traffic prohibition signs?

Traffic prohibition signs are circular signs, which include prohibition signs, speed limit signs, etc. The specifications are 60CM, 80CM, 100CM, and 120CM in diameter. According to the road speed, the diameter is 60CM and 80CM use more. The one with a diameter of 60CM is suitable for use in residential areas, factories, rural roads and other places; the one with a diameter of 80CM is suitable for use on connecting roads and ramps. 100CM and 120CM are suitable for use on main highways and cantilevered signs. For more information, please refer to Lefen Advertising Signs.