@article{ref1,
title="Speed choice, speed variance, and speed limits: A second-best instrument to correct for road transport externalities",
journal="Journal of transport economics and policy",
year="1998",
author="Rietveld, Piet and Shefer, D.",
volume="32",
number="2",
pages="187-202",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0022-5258",
doi="",
url="http://dx.doi.org/"
}