@article{ref1,
title="Use of Pre-Signals in Advance of a Highway-Rail Grade Crossing: A Specialized Tool With Specific Applications",
journal="ITE journal",
year="2006",
author="Gilleran, BF",
volume="76",
number="5",
pages="22-25",
abstract="The U.S. highway system frequently shadows the existing railroad network, resulting in numerous highway-rail grade crossing close to highway intersection. Highway traffic signals are used with active warning devices at some of these crossings. In some cases, the highway signal has been installed in front of the railroad warning devices. This is known as a pre-signal.   <p>Language: en</p>",
language="en",
issn="0162-8178",
doi="",
url="http://dx.doi.org/"
}