@article{ref1,
title="Traffic Signal Change Intervals: Policies, Practices, and Safety",
journal="Transportation quarterly",
year="1986",
author="Stein, H. S.",
volume="40",
number="3",
pages="433-445",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0278-9434",
doi="",
url="http://dx.doi.org/"
}