TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

VISIBILITY OF CIRCULAR TRAFFIC-SIGNAL INDICATIONS

Accession Number:

00345314

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/isbn/0309032520

Abstract:

An empirical determination of traffic signal visibility is presented. The study used subjects seated in stationary vehicles viewing standard, full-sized traffic-control signals at distances ranging from 370 to 1300 ft. Data, including response accuracy and response latency, were collected for both day and night ambient lighting conditions. It was found that currently used circular traffic-signal indications are generally adequate for nighttime service but their adequacy for daytime conditions is suspect. Signal visibility was found to be somewhat insensitive to signal lens size and illumination intensity for nighttime operations, which implies that even the dimmest signal tested (8-in lens with 67-W bulb) is above threshold visibility for all distances at night. The single most important factor affecting the visibility of traffic signals during the day is signal color. Green indications generally led to the poorest subject response, in terms of both response accuracy and response time, for the daytime observations. In relation to visibility considerations alone, the data obtained present strong support for the possibility of dimming all colors of 12-in signal indications at night. (Author)

Supplemental Notes:

Publication of this paper sponsored by Committee on User Information Systems. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Accession #:

00362058

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

King, Gerhart F

Pagination:

pp 7-14

Publication Date:

1981

Serial:

Transportation Research Record

Issue Number: 811
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309032520

Media Type:

Print

Features:

Figures (4) ; Maps (1) ; References (12) ; Tables (5)

Old TRIS Terms:

Subject Areas:

Highways; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure

Files:

TRIS, TRB

Created Date:

Jan 29 1982 12:00AM

More Articles from this Serial Issue: