Legal analysis: there is no requirement to limit the height of rural roads. Expressway must have a certain clearance. The clearance requirements for high-speed, first-class and second-class highways are 5.0m, and those for third-class and fourth-class highways are 4.5m.. The height limit of 3.5m is estimated to avoid overloading. Or tunnels and bridges or something. There is nothing I can do about it. The height limit cannot be set casually. It can be proposed by the road owner and must be approved by the local transportation department.

Legal basis: Article 50 of the Highway Law of People's Republic of China (PRC) stipulates that vehicles exceeding the load, height, width and length limits of highways, highway bridges, highway tunnels or car ferries are not allowed to drive on roads, highway bridges or highway tunnels with limited standards, and car ferries are not allowed to be used. If it is really necessary to drive beyond the load limit standard of roads or highway bridges, it must be approved by the transportation department of the local people's government at or above the county level and take effective protective measures as required; If traffic safety is affected, it shall also be approved by the public security organ at the same level; Those who carry indissoluble and out-of-gauge articles shall drive at the prescribed time, route and speed, and hang obvious signs.