Citation

Woltman HL, Szczech TJ. Transp. Res. Rec. 1989; 1213: 21-26.

Copyright

(Copyright © 1989, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

The widespread use of retroreflective materials for information, regulation, and warning signs and the inclusion of retroreflective materials in many official standards suggest that a framework of luminance standards for minimum visual performance be adopted. Such a construct assumes that a variety of signing materials are available from which predictions of performance may be made. A methodology is provided to compare signing materials in a variety of placements, road geometries, and distances for existing types of retroreflective materials. The study compares the performance of retroreflective materials for existing headlamps and under many circumstances of use. Information is also provided on allowances for such factors as complex nighttime surroundings, the unalerted driver, and the relative importance of sign priority.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1989/1213/1213-004.pdf

Language: en

Keywords

Traffic Signs, Signals and Markings; Highway Signs, Signals and Markings--Standards; Light Sources