@article{ref1,
title="Yellow signal is not a clearance interval",
journal="ITE journal",
year="1981",
author="Bissell, H. and Warren, D.",
volume="51",
number="2",
pages="14-17",
abstract="The paper presents a review of the literature that deals with the research and interpretation of a yellow signal indication, and dispels the concept that the yellow signal is a clearance interval for traffic signal control at intersections.<p />",
language="",
issn="0162-8178",
doi="",
url="http://dx.doi.org/"
}