Is there a legal basis for setting height limit for county roads?

County roads generally adopt three or four highway standards; The township roads adopt Class IV highways or other external signposts.

According to the technical standards of highway engineering, the clear height of expressways, first-class highways and second-class highways is 5m, and the clear height of third-class highways and fourth-class highways is 4.5m The height limit cannot be set at will. Generally, in order to maintain the road, the road owner will weld a rectangular frame with steel pipe at the intersection after the approval of the local transportation department, and the height and width will be processed according to the required size. For safety reasons, yellow and black reflective films need to be attached. In addition, warning signs will be set up at intersections in advance. After seeing the height limit standard, passing drivers need to measure the height of their vehicles in advance. Once they find that they exceed the height limit, they need to detour.

Generally, the first-class highway can accommodate 65,438+00,000 ~ 25,000 vehicles (including motorcycles) converted into the annual average day and night traffic volume of passenger cars. It is an expressway connecting important political and economic centers and leading to key industrial and mining areas, ports and airports, which is specially designed for cars to drive alone and partially control traffic.

According to the current technical standard of highway grade in China, the first-class highway is a multi-lane highway for cars to travel in different directions and lanes, and the traffic can be controlled as needed. The standard four-lane first-class highway should be able to adapt to the annual average daily traffic volume converted from cars to buses, 15000-30000 vehicles, and the six-lane first-class highway should be able to adapt to the annual average daily traffic volume converted from cars to buses, 35000-55000 vehicles.

There are three design speeds of the first-class highway: 100KM/H, 80KM/H and 60 km/h, which are 100KM/H or 80KM/H when it is a trunk highway and 80KM/H or 60 km/h when it is a distributed highway. ..

Secondary roads are divided into two types: special secondary roads for automobiles and general secondary roads. The secondary highway for automobiles can adapt to the average annual traffic volume of medium-sized trucks modified by various automobiles (including motorcycles) of 4500-7000 days and nights, and it is a special highway for automobiles connecting political and economic centers or large industrial and mining areas, ports, airports and other places. General secondary roads can adapt to the average annual day and night traffic volume of medium-sized trucks modified by various vehicles, which is a road connecting political and economic centers or large industrial and mining areas, ports, airports and other places. These two types of secondary roads are two lanes, and their subgrade width is generally 1 1 m, and the secondary road for automobiles is 9 m. General secondary roads are 12m and 8.5m respectively.