Assessment of contrast perception of obstacles in a tunnel entrance.

ABSTRACT: Background: The purpose of this study was to assess the contrast perception of obstacles in a tunnel entrance which was placed in Ilam Province, Iran. Methods: An obstacle with the reflection coefficient of 20% was mounted at the entrance of thetunnel and then, the car was placed near the tunnel entrance and the intrinsic luminance of the road (L_r,intrinsic) and obstacle (L_o,intrinsic) were measured inside the car using the luminance meter. Results: Intrinsic luminance of obstacle and road at the entrance of the tunnel were measured as 41 and 17 cd/m², respectively. The contrast perception of obstacle in deriver's eyes and in the safe stopping distance (SSD) from the tunnel entrance was determined as 2.79 cd/m². At the entran

SUBMITTER: Mehri A 

PROVIDER: S-EPMC6249494 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature