@article{ref1,
title="Use of turn signals on the expressway",
journal="Traffic safety research review",
year="1968",
author="Vopel, C and Miller, Tyler and Haddock, R and Zuercher, J",
volume="12",
number="4",
pages="56-59",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0564-0741",
doi="",
url="http://dx.doi.org/"
}