Why are there no street lights on the highway? These freeway cold knowledge will tell you today

In the last issue, Xiaozhe brought you the "cold knowledge" of expressways. There are also zebra crossings on the expressway? Do you know all these "cold knowledge"? In this issue, Xiaojiao has collected several "cold knowledge" for everyone, let's "increase knowledge" together~ What are the characteristics of the 01 Expressway? Expressways are high-grade highways. It has the following characteristics: fully enclosed, bidirectional separation, driving control entrances and exitsThe "Technical Standards for Highway Engineering" stipulates that highways are multi-lane roads that provide vehicles with different directions, lanes, and all entry and exit. The average annual daily designed traffic volume of highways should be more than 15,000 passenger cars. Article 67 of the Road Traffic Safety Law of the People's Republic of China stipulates that pedestrians, non-motor vehicles, tractors, wheeled special mechanical vehicles, articulated passenger cars, fully-traveled trailers and other motor vehicles with a maximum designed speed of less than 70 kilometers per hour shall not enter the expressway. The maximum speed indicated by the expressway speed limit sign shall not exceed 120 kilometers per hour. There is a conflict between the speed limit of the 02led display screen and the speed limit of the roadside sign. Which one shall prevail? If there is a conflict with the speed limit sign on the roadside, the speed limit of the LED display should be based on the speed limit, and its priority should be higher than that of the fixed ones on the roadside. Because it will not change when fixed on the roadside, only the LED display can change at any time. When the visibility is low, for driving safety and reduce accidents, the speed limit will be adjusted at any time. So when you see that the speed limit has changed, the LED display should be based on the standard and do not speed up.03 Can the deceleration marking area be changed? Drivers who run less highways may not necessarily see this marking. As shown in the figure below, the dotted line of the diamond block distributed on both sides of the lane dividing line is the deceleration marking, also known as the "fish bone line".It is generally distributed in sections of roads that are frequently affected by curves, long downhills, etc., which is designed to make the driver's subjective vision feel that the lane is gradually narrowing, remind them to improve their attention and take the initiative to slow down.So whether the lane can be changed in the deceleration mark area depends on the lane dividing line. If it is a solid line, it cannot change lanes, and if it is a dotted line, it can change lanes. 04 Why are there no street lights on China's expressways? Have you noticed that driving on the highway at night, except for the headlights of the car, the surroundings are always dark. Why are street lights not installed on the highway? Isn’t driving at night safer? There are two reasons: one is that the highway road conditions are good. The sections of highways are basically far away from the bustling urban areas, and pedestrians and non-motor vehicles are prohibited from entering. Therefore, you can drive normally on the highway by relying on the headlights. The highway has good road conditions and a high safety factor. The second is safety hazard. Experimental results have proved that if a lamp swings by in front of the eyes, the light and dark illumination effect will cause eye illumination oscillation, causing visual fatigue of the driver. When the driver is driving at a constant speed at a high speed, the street lights with light and darkness form a fixed rhythm, and the long-term alternation of light and darkness will even bring about a "hypnosis" effect.Of course, there are complete reflective sign systems on the expressway, such as hot melt reflective marking lines (lane lines, etc.), film-type reflective contour markings (isolation belts, guardrails, etc.), luminescent ground nails, etc., which do not usually shine. Only when the car headlights are exposed to strong light, the light will be reflected in a directional direction into the driver's eyes. Moreover, there are no street lights throughout the expressway. In the "Highway Tunnel Design Code" and "Road Lighting Design Code", the document mentions that tunnels with a length of more than 100 meters should be equipped with lighting, and street lights should also be installed at the overpass or ramp locations, not only should they be installed, but also "high pole lights" must be installed to light from top to bottom. 05What about the concave and regular pits or densely raised speed bumps on the side of the driving lane? Careful drivers find an interesting design. Regular, dense, and sunken designs will appear on the shoulders next to the driving lane. Why do you need to press these pits on a good road? What are these designs used for?It turns out that this design is called "vocal cords". The purpose of setting it is to use the violent rolling friction sound generated between the vocal cords and the car wheels to remind the driver to promptly correct the deviated driving direction, prevent and prevent fatigue or negligent drivers from driving the car into the shoulder and rush out of the road, and reduce the occurrence of traffic accidents. The vocal cords placed at the edge of the driving lane can also play a role in harsh climates. Heavy rain and light snow often blur the boundaries of the road surface. In the case of very low visibility, the vocal cords provide the driver with a clear road reference, ensuring that the vehicle is always in the correct driving lane. Source: China Highway, Fujian Transportation Editor: Ni Xiaolan Wonderful Attractions This cross-river bridge is 15 years old! Wherever it is there, there are "blockbusters" everywhere, pay attention to it! The s19 Xinwei Expressway Luxiang Interchange and Zhangyan Interchange will be fully closed during these two periods of construction. The Shanghai Maglev Line pilot bank card and digital RMB hard wallet card swiping function of swiping and passing the gate due to conditions. Due to the limitations of the new media works published in this account may not be able to contact the relevant rights holder before being cited, and there will be no signing of the pictures, texts and video materials for citations. Here, we warmly welcome the relevant rights holders to contact the editorial department, and we will promptly correct or delete them. Email: [email protected] Shanghai Municipal Transportation Commission Propaganda and Display Center Author: Shanghai Transportation