@article{ref1,
title="Update on highway safety hardware",
journal="Traffic engineering",
year="1977",
author="Rowan, Neilon J. and Marquis, EL and Johnson, J. H.",
volume="47",
number="5",
pages="38-42",
abstract="Four steps are outlined that should be followed to improve roadway safety through redesign, as well as the state of the art concerning various devices and methods necessary to apply them properly.<p />",
language="",
issn="0041-0675",
doi="",
url="http://dx.doi.org/"
}