Optimization of Length of Enhanced Lighting in Day at Long tunnel Entrance of the Expressway
ZHAO Wei-hua
ZHANG Dong-mei
WEN Ying
HAN Wei
LIU Hao-xue
Abstract：Although the illuminations of the entrance are prescribed by the tunnel ventilation and lighting standards the relative parameters are too rough.The enhanced lighting in practice is not in according to the re-quirements and designed as ladder down.For dark adaptation time of drivers are satisfied by enhanced lighting 31 subjects were selected to join the daytime dark adaptation time determination experiments.After subjects were fully adapted to daytime illumination of natural light enter the low illumination environments.Dark adap-tation time of different drivers is recorded through the time of logo recognition.Statistical methods are used to get the adaptation time in different illumination of drivers and the optimal length is calculated.The result shows that under the condition of enhanced lighting at entrance in daytime , length of every segment is too short.The appropriate transition of vision can not be guaranteed.Length of every segment should be defined according to the dark adaptation time and speed.The length values of enhanced lighting segment are proposed in this paper can guarantee full dark adaptation time of drivers.
Keywords：Long TunnelEntranceDayDark adaptionStrengthen lighting length
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 48-52 )