Analysis in security brightness critical threshold of highway tunnel entrance environment

To analyze the highway tunnel's lighting in safe driving conditions, security critical threshold of the environment brightness is given. The tunnel brightness environmental recognition experiments and two kinds of experiments models, the dynamic and static ones, were designed. Base on more than 7 020 experimental data, an exponential law was found between the environment brightness and human eyes response time. Combining the driver's traffic information identification time, the security critical threshold of the environment brightness is got. Furthermore, sources from the engineering data of three highway tunnel, long, middle and short respectively, a conclusion of the security critical threshold of the environment brightness is 0.5 cd/m2, and 0.5 cd/m2 is much less than the values recommended by the CIE adaptation curve, so the highway tunnel lights can be greatly simplified and lowered. ©, 2015, Zhejiang University. All right reserved.