@article{ref1,
title="Costs of Delays to Emergency Vehicles at Rail-Highway Grade Crossings",
journal="Transportation quarterly",
year="1990",
author="Ryan, TA",
volume="44",
number="4",
pages="549-562",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0278-9434",
doi="",
url="http://dx.doi.org/"
}