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How wide is the rural entrance road? How much does it cost to build roads in rural areas?

3-4m, 400 yuan. According to China's national standard "Technical Specification for Rural Highway Engineering", the design standard width of the entrance road is 3-4m, of which 3m is suitable for one-way traffic and 4m is suitable for two-way traffic. If the roadbed is 3 meters wide and one meter long is 3 square meters, then the direct cost of one meter long road is 400 yuan.