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Highways are high-grade roads. According to the "Technical Standards for Highway Engineering" of the Ministry of Communications of the People's Republic of China, the expressway refers to "a road that can adapt to the annual average day and night small passenger car traffic of more than 25,000 vehicles, which is specially designed for high-speed driving of motor vehicles and full control of access." Although countries have different names for highways, they all refer to roads with more than 4 lanes, two-way separation, full control of entrances and exits, and all three-dimensional intersections. In addition, there are many countries that directly control the entrances and exits, and not all of them use stereoscopic cross-links, also known as highways. In general, highways can accommodate speeds of 120 km/h or higher, and roads have a width of more than four lanes. Separation belts are arranged in the middle, using asphalt concrete or cement concrete high-grade pavement, with complete signs, markings, signals and lighting devices; pedestrians and non-motor vehicles are prohibited from walking on the road, and other lines are used for three-dimensional crossing, pedestrian overpasses or Passed through.