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 of viaducts and overpasses is generally between 2.8 meters and 3.6 meters, and the height limit of highway and railway bridges is between 3.5 meters and 4.5 meters.

The general trunk highways in counties and towns above the county level belong to Class III highways, and the branch highways in counties, townships and villages belong to Class IV highways.

The specification requirements for setting height limit signs on urban roads are as follows:

When the clear height of urban expressways and main roads is less than 5m, and the clear height of other roads is less than 4.5m, a height limit sign shall be set, and the height limit value shall be less than the actual clear height by 20cm.

When setting height signs, they should be set in advance at the exit of the intersection in front of the restricted location except the restricted location.

Extended data:

20 14 Up to now, there have been 45 cases of passengers hitting the height limit pole due to improper passenger carrying. Among them, except for 1 case, which was a collision accident in the camera work of the wedding company, the rest cases were caused by illegal manned trucks or agricultural tricycles.

Because the victims of such accidents all collided with the height-limiting facilities without any protection, the injuries caused were serious, and most of them were head injuries. In 22 cases, the parties died unexpectedly, and 5 others were first-and second-degree disabled and needed lifelong care.

Although the above-mentioned cases occurred all over the country, the standards for the division of responsibilities by the courts are relatively consistent. The driver knows that the hopper can't carry people, but he still allows the victim to take the car. The victim, as an adult, should have foreseen the danger of riding in the bucket but decided to ride. Therefore, both the driver and the victim should bear the corresponding responsibility for the accident.

However, the management of height limit pole has not been excluded from the scope of accountability. Among the above 45 cases, 22 cases, accounting for nearly 50%, were found to be the responsibility of the management by the court because of setting height limit poles without approval, no obvious warning signs, dereliction of duty in management, and the actual height being lower than the elevation. The responsibility of the management party shall be determined by the court according to its fault, and the proportion of responsibility varies from 10% to 50%.

Among them, there was a case where the height limit pole was too low, only 2.2 meters, and the victim's impact caused four-level disability of limbs and six-level disability of vision. The court found through trial that the height limit pole involved in the case could not guarantee the safe passage of fire fighting and ambulances, and the management was responsible for 50%. This case is the one with the highest proportion of responsibility in such cases.

People's Daily Online-Limit the height of the pole and hit the teenagers, causing heated discussion. Nearly half of the cases were judged as management responsibility of height limit pole.