@article{ref1,
title="Towards a unified theory of road traffic",
journal="Operations research",
year="1958",
author="Haight, Frank A.",
volume="6",
number="6",
pages="813-826",
abstract="unavailable]  <p>Language: en</p>",
language="en",
issn="0030-364X",
doi="",
url="http://dx.doi.org/"
}