@article{ref1,
title="Towards a unified traffic science",
journal="IATSS research",
year="1990",
author="Mackay, G. Murray",
volume="14",
number="1",
pages="19-26",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}