The mountainous areas and the areas with poor economic development have already become the key places for the construction of expressways. The wind speed of the mountainous expressways is always influenced by the mountains and valleys, and the average wind speed can only be 1.2m/s, and the forest condition with the moist climate makes it easy to have mist in those areas. In addition, the expressways covers long distance, especially in rural or mountainous areas, the condition of the expressways will become relatively complicated. The distribution of the mist is uneven, so the visual may be clears in this section but blur of that section. Those situation always happens at night, and when the high-speed cars drive into the area with thick fog, the drivers will feel dark suddenly, and some may not adapt the sudden change in visual, which may frighten them to increase the possibility of the happening of traffic accidents.
Driving at night should follow one principle, which is safety comes first. In the arrangement of tour, it will not be good to drive at night, which is not afraid of the ghost appear in the stories, but for that driving at night will bring more hidden dangers, especially when driving in long distance. Night driving will make the drivers cannot see the exact way behind, if driving in rainy or foggy days, the road condition will be much more complex.
The appearance of the solar road studs can solve nearly all the problems described before. The solar road studs have the features of strong pressure resistance, high brightness, water-proof and long service time, which are suitable to be applied on the expressways or roads in cities to guarantee the night-driving safety of the drivers and delineate the ways for them. In addition, the solar road studs are energy saving, for they absorb solar energy through the solar panel in the daytime, which can be transformed into electrical energy, which is stored inside the battery, and at night, the electrical energy can light the LEDs and provide bright for the passing drivers and pedestrians.
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