Citation

Shah SC, Ray GL. Transp. Res. Rec. 1977; 647: 52-59.

Copyright

(Copyright © 1977, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

This paper discusses the effects of sign size, height of sign installation, and sign legend on driver responses measured by speed, conflict, and queuing parameters. Effects of flashing chevrons were also evaluated in terms of these responses. The experiment was conducted on two-lane highways and the Interstate system at four locations. The conclusions based on the analysis and evaluation of the various responses using standard statistical procedures, are that (a) speed decrease at two-lane locations was greater for the 0.76-m (30-m) signs than either the 0.91-m (36-in.) or the 1.22-m (48-in.) signs; (b) at Interstate locations, the 0.91-m (36-in.) sign yielded better overall response than the corresponding 0.76-m (30-in.) signs; (c) installation height of 0.31 m(1 ft) and 1.52 m (5 ft) and sign legend did not indicate any statistical difference in the measured response; (d) two-way flashing chevrons greatly enhanced the obedience of the driver to warning signs; and (e) differences in responses by location can be discussed in terms of traffic volume and the motorists attitudes toward signing in general.