@article{ref1,
title="American research in intelligent vehicle-hiway systems -- an overview",
journal="IATSS research",
year="1991",
author="Chen, Kun and Ervin, R. D.",
volume="15",
number="1",
pages="49-55",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}