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The highway is a high-grade highway. The "Highway Engineering Technical Standards" of the Ministry of Communications of China stipulates that expressways refer to "highways that can adapt to an average annual day and night passenger car traffic of more than 25000 vehicles, are dedicated to separate high-speed vehicles, and fully control access". Although countries have different names for highways, they all refer to highways with more than 4 lanes, two-way separation, complete control of entrances and exits, and all three-dimensional intersections. In addition, there are many countries on the partial control of the entrance, not all the use of three-dimensional cross-the direct trunk line is also known as the highway. International Road