@article{ref1,
title="Impacts of progressive signal systems with low progression speed on traffic safety and the urban traffic flow",
journal="IATSS research",
year="1996",
author="Schuster, G",
volume="20",
number="2",
pages="92-99",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}