Optimization design of highway tunnel lighting entrance section for safety and energy saving

In order to solve the contradiction between over-luminance and under-luminance in the highway tunnel lighting system, an entrance section luminance curve optimization design method is proposed to the purpose of traffic safety and energy consumption reduction. Firstly, under the constraints of the Rules and Guidelines, the objective function of luminance curves optimization considering over-luminance and under-luminance is constructed, and the four-step optimization model and design parameters of the entrance section luminance curve are given. Then the luminance curve optimization model is evaluated and analyzed in terms of comfort, safety and energy saving effect.Finally, combined with the actual tunnel, it is verified that compared with the Rule method, the proposed design method reduces the maximum luminance ratio of adjacent sections by 26.5%, and the lighting step curve in the second half of the entrance section is reduced by 95.7% compared with the adaptive curve.The power consumption was reduced by 6.1% and 6.3% for HPS and LED lights, respectively, compared to the design method considering only traffic safety.