Beijing University of Technology

Guizhou Expressway Group Co., Ltd (cn)

Xiaoshun Lu

Feng Liu

Meng Wang

Xiaoyu Li

Yuanfeng Zhang

Xiaojuan Gao

Jianping Cao

Jiangbi Hu

Xiaoqin Zhang

Linxi Gao

Wenqian Ma

Weili Wang

Da Guo

Shilong Mei

The invention relates to an illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition. The method includes: (a) setting light environment parameters of the tunnel entrance section; (b) determining a feature position in the tunnel, and measuring the average road surface brightness L of the feature position; (c) placing a target object in the feature position and then making a driver drive at different speeds from outside the tunnel towards the target object to measure visual recognition distances D required by the driver to visually discover the target object under different driving speeds, and measuring the road surface brightness Lat the position where the driver visually discovers the target object and calculating the brightness reduction factor K to be the ratio between L and L; (d) resetting the average road surface brightness L of the tunnel entrance section and repeating steps (b) and (c) to obtain a plurality of different sets of visual recognition distances D and corresponding brightness reduction factors K; (e) using Sigmoid function model to calculate and fit the data of the plurality of sets of D and K to obtain a relational model formula of D and K: (f) substituting a safe stopping sight distance Dcorresponding to a maximum speed limit of the tunnel into the formula to obtain the minimum brightness reduction factor Kof the tunnel entrance section in daytime. The invention also relates to a system for implementing the illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition.

Illumination standard calculation method and system for a tunnel entrance section in daytime based on safe visual recognition

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Beijing, China

Xiaoshun Lu