Guizhou Express High-speed "Black Hole Effect"

On December 20, experts from the Chinese Academy of Sciences and academicians of the Chinese Academy of Engineering reviewed and approved the “Mountain Expressway Tunnel Light Environment” project developed by the Guizhou Provincial Department of Transportation. The scientific and technological achievements have solved the "black hole effect" of highways in mountainous areas in Guizhou Province. The bottleneck in safe driving...

It is reported that the cracking of this scientific research result not only reduces driver's sight line difficulty, reduces tunnel accident rate, but also illuminates energy consumption.

Due to the influence of geological structure control, Guizhou Province has high mountain ranges and high ridge-valley height differences, and the plateau and mountainous areas account for 87% of the entire province.

In recent years, in the construction of highways in Guizhou Province, there have been more and more tunnels and longer and longer tunnels. For example, the section of Xiamen-Chengdu Expressway, the longest tunnel in Guizhou Province, boasts a total length of 4,752 meters and the length of the Shuidu Line tunnel accounts for 36% of the total mileage of the line. The operating fees and maintenance fees for tunnels are relatively large. In particular, tunnels with higher lighting requirements have more prominent contradictions between lighting energy conservation and lighting safety.

Guizhou Provincial Department of Transportation once investigated the overall lighting conditions of more than 10 expressway tunnels including Shanghai-Kunming and Hangrui. 500 survey questionnaires showed that 41% of drivers believe that the tunnel lighting conditions in Guizhou Province are overall dark and 14% driving. The staff thinks the lighting is too dark. It is believed that 78% of the drivers in the tunnel entrance and exit section are the most dangerous locations in the tunnel.

How does it feel to drive in the tunnel? Master Wang, who often ran long-distance inter-provincial freight, told him that although he had a lot of experience, he would be worried about the height of the tunnel and the existence of obstructions after entering the tunnel. Therefore, he would try to cross the long tunnel during the day with good light and concentration. .

The traffic accident management department believes that one of the main reasons for the frequent occurrence of highway tunnel accidents is that the tunnel entrance lighting is too different from the middle section of the tunnel, causing the driver's visual ability to decline. Although the number of tunnel accidents is relatively small in the total number of road traffic accidents, the number of serious accidents, deaths, and direct property losses occupies a large proportion, and tunnels are more likely to cause secondary accidents.

“The tunnel light environment is actually creating an environment close to natural light in the tunnel, so that the physiological visual and psychological feelings of the driver in the tunnel are not significantly different from those in the open air.” said the chief engineer of Guizhou Express Group, is to let When the driver enters the tunnel, the vision is safe and comfortable, and then he safely drives out of the tunnel.

In the research and development, it is necessary to calculate the brightness requirements under different light environments, vehicle speeds, and traffic conditions to achieve dimming techniques that meet safe driving under different conditions.

During the R&D process of Guizhou Expressway Group, without any light source enabled, it was found that the shadows 20 meters away from the Guilin Tunnel at the trial section of Sijian Expressway were clearly visible. With the energy-storage light-emitting technology of coatings, even the words on newspapers can be seen.

The Chief Engineer demonstrated to the reporter on the energy storage lighting technology that a brick coated with paint was placed in a dark place where there was no natural light, and the brick immediately showed a bright color, and it continued to light for 12 hours without any light source supplementation. If the interior wall of the tunnel is entirely coated with this kind of paint, the driver in the tunnel can obtain better brightness.

Sanli Expressway, which will soon be opened to traffic, is the first highway in Guizhou to use this technology. In the 14 tunnels on the Sanli Expressway, stepless dimming, color-changing temperature technology, and energy-storage lighting technology are applied. The driver may feel the convenience brought by this result.

At present, the highway tunnel lighting tariffs managed by the Guizhou Expressway Group are approximately 50 million yuan each year, of which 80% are consumed by high-pressure sodium lamps and 20% are consumed by LEDs and other light sources. After the comprehensive application of the light environment application project, according to the current total electricity consumption, it will save 30.80 million yuan in operating electricity annually, and achieve an energy saving target of 61.6% overall. Each year, the energy consumption of tunnel lighting is reduced by 34.22 million kWh, equivalent to 11,000 tons of standard coal, and the society will reduce CO2 emissions by 34,500 tons.