Safety evaluation index on daytime lighting of tunnel entrances

Jiangbi Hu,Pengfei Xu,Guangying Miao,Ronghua Wang,Xiaojuan Gao

doi:10.1177/1687814019854568

Abstract

A large luminance difference between outside and inside the entrance of a tunnel, with inappropriate lighting, could result in short-term visual impairment and other hidden dangers. At present, alm...

Highlights

The entrance is the transition section of the running environment from the outside to the inside of a tunnel
When the color temperature outside is higher than 6000 K, with increase in the artificial lighting color temperature inside the tunnel entrance, the luminance reduction coefficient threshold value shows an upward trend
This article determines the mathematical relationship between recognition distance and luminance reduction coefficient under different color temperatures using experimental data from real vehicles, studies the difference in recognition demand under different color temperatures, and obtained the index and corresponding values in the appraisal of daytime tunnel entrance lighting

Summary

Introduction

The entrance is the transition section of the running environment from the outside to the inside of a tunnel. In order to eliminate the influence of road alignment and traffic conditions on the driver’s recognition, the experiment was carried out at a highway tunnel entrance paved with asphalt concrete in Guizhou Province, which is straight, low in traffic volume, and gentle in slope gradient, and whose design speed is 80 km/h. This test selected higher than 6000 K (A1) and lower than 6000 K (A2) two color temperature levels outside the tunnel, and 3500 K (B1), 4000 K (B2), 4500 K (B3), 5000 K (B4), 5500 K (B5), 6000 K (B6) 6 color temperature levels of artificial light at the entrance of the tunnel. In order to ensure the synchronism of the test instruments, the timer on the instruments must be calibrated before tests

Findings

Result and discussion

Conclusion