@article{ref1,
title="Left-Right: Why Driving Rules Differ",
journal="Transportation quarterly",
year="1982",
author="Hopper, Robert H.",
volume="36",
number="4",
pages="541-548",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0278-9434",
doi="",
url="http://dx.doi.org/"
}