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Title:

Effect of Windshield Veiling Glare on Driver Visibility

Accession Number:

01103773

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States
Order URL: http://www.trb.org/Main/Public/Blurbs/160463.aspx

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Order URL: http://worldcat.org/isbn/9780309113274

Abstract:

This paper presents results of a veiling glare prediction model that was developed by modeling veiling glare luminance measurements and by using Blackwell’s visual contrast threshold data. A critical visibility condition for a driver approaching a tunnel with the sunlight falling on the windshield and attempting to detect a target inside the tunnel was modeled. The luminance of windshield reflections of 38 instrument panel samples was measured in a specially designed veiling glare simulator by varying the sun angle, the windshield angle, and the instrument panel angle. The measurements were used to develop a regression model to predict the veiling glare coefficient as a function of windshield angle, sun angle, instrument panel angle, and instrument panel material gloss value. The developed visibility–distance prediction model was exercised by varying eight factors: (a) windshield angle, (b) instrument panel angle, (c) sun angle, (d) sun illumination incident on the windshield, (e) gloss level of the instrument panel material, (f) driver’s age, (g) target size, and (h) illumination incident on the target in the tunnel. For example, under a worst-case situation of 45,000-lux sunlight illumination incident on the windshield, a 65-year-old driver will not be able to see a 2-ft² 10% reflectance target while approaching a dark tunnel with 100 lux of tunnel lighting. In contrast, if the tunnel lighting is raised to 5,000 lux, the 65-year-old driver can see the target from 650 ft, and a 25-year-old can see it from 4,900 ft.

Monograph Accession #:

01114728

Language:

English

Authors:

Bhise, Vivek D
Sethumadhavan, Susheel

Pagination:

pp 1-8

Publication Date:

2008

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: 2056
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

9780309113274

Media Type:

Print

Features:

Figures (8) ; Photos (1) ; References (7) ; Tables (2)

Subject Areas:

Bridges and other structures; Highways; Safety and Human Factors; Society; I83: Accidents and the Human Factor

Files:

TRIS, TRB, ATRI

Created Date:

Jan 29 2008 2:30PM

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