@article{ref1,
title="A History of Roundabouts in the United States and France",
journal="Transportation quarterly",
year="1988",
author="Todd, K.",
volume="42",
number="4",
pages="599-623",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0278-9434",
doi="",
url="http://dx.doi.org/"
}