Only with a "blueprint" can there be "milestones." The content of the signs must be planned based on the actual conditions of the highway sections (such as curves, tunnels, and service area locations), in accordance with the national standard "Traffic Signs and Road Markings." For example, the dimensions, proportions, and font sizes of speed limit signs, prohibition signs, and warning signs are strictly regulated—typically, the text on general signs must remain clearly visible from 30 meters away, and reflective materials ensure visibility under nighttime vehicle headlights.



















