@article{ref1,
title="Poor visiblity under low-beam headlights: a common cause of wrong-way driving",
journal="Transportation research record",
year="1977",
author="Vaswani, N. K.",
volume="628",
number="",
pages="52-56",
abstract="Through selected case studies, this paper illustrates the way in which the inadequate visibility of road signs and pavement markings at night contributes to wrong-way driving. A concept termed the keg of legibility, which delineates the limits of nighttime visibility under low-beam headlights, is described. The application of the keg-of-legibility concept to the placement of signs, markings, and additional devices that help guide the motorist through the intersection of a four-lane divided highway and another road is discussed. Examples of wrong-way entry on roads having poor geometrics are used to emphasize the need for such guidance.<p />",
language="en",
issn="0361-1981",
doi="",
url="http://dx.doi.org/"
}