Sihai network

Why is there no street light on the highway? It's all because of it

As we all know, urban roads are basically equipped with street lamps every 20 or 30 meters. Street lamps can provide bright vision for vehicles on the road and play a very important role in the safe driving of drivers. However, in the process of driving on the expressway, many car owners will find that there are no street lamps on both sides of the expressway. This phenomenon is basically the same as that of expressways all over the country, This makes many car owners wonder why the highway is not equipped with street lights?

Does the highway need street lights

First of all, we should know that the main function of street lamps is not to illuminate the road surface, but to facilitate pedestrians and protect non motor vehicles. The expressways are completely closed, without pedestrians and non motor vehicles, and the road surface is relatively flat, without traffic lights and sharp turns. Therefore, strictly speaking, highways do not particularly need street lights. Moreover, all motor vehicles have driving headlights, which can meet the lighting requirements of driving at night. In addition, there are several reasons why there are no street lights on expressways.

The cost of setting street lamps at high speed is high

So far, the total mileage of expressways in China has exceeded 140000 kilometers. One street lamp is set every 100 meters, and the installation cost and maintenance cost are astronomical. Moreover, many expressways do not have a particularly large traffic flow. If they are illuminated for a long time, it will cause a waste of resources. Therefore, the first reason why street lamps are not set at high speed is that the installation cost and management cost are too high.

The safety factor of expressway is high

At present, China's expressways are basically fully closed roads, only motor vehicles are allowed, and non motor vehicles and pedestrians are not allowed. Therefore, the road condition of expressway is much better than that of ordinary highway, so it is not necessary to set street lamps to illuminate the whole line.

Setting street lamps will have potential safety hazards

Because the setting of street lamps on the expressway can not be illuminated continuously, the interval between street lamps will have a certain rhythm when vehicles drive at a uniform speed on the expressway. Once, Philips China Research Institute had an experiment in which the maximum eye position illumination of the driver was determined by the 70 DEG of the nearest street lamp; Provided by the angle light, the light greater than this angle will be blocked by the roof, and the eye illumination near this angle will drop sharply. In short, when we drive, some street lights are blocked by the roof, and the light and shade are alternating, which will produce the feeling of light shaking. If this continues to affect for a long time, the driver will have a feeling of dizziness, which can also be understood as' Hypnosis'. Driving in this state is very dangerous.

The reflective system can ensure driving safety

There is a perfect reflective sign system on the expressway, including hot-melt reflective markings (lane line, etc.), film reflective contour markers (isolation belt, guardrail, etc.), luminous ground nails, etc., which can reflect Lane indication markings, traffic signs, roadside contour, Lane division line and central separation belt contour, etc. Therefore, at night, as long as the driver turns on the lights, these reflective systems can play a role and play a real-time guiding role.

Street lamps hinder military function

Some domestic expressways have war preparedness functions. We usually take the expressways. If we want to take off and land on the expressways in case of war, fighters can also take off and land on the expressways. If street lights are installed, it will hinder the takeoff and landing of fighters.