@article{ref1,
title="On exposure and accident rate",
journal="Traffic engineering and control",
year="1995",
author="Hauer, Ezra",
volume="36",
number="3",
pages="134-138",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0041-0683",
doi="",
url="http://dx.doi.org/"
}