@article{ref1,
title="Highway safety: twenty years later",
journal="Transportation research record",
year="1986",
author="Cirillo, Julie Anna and Council, Forrest M.",
volume="1068",
number="",
pages="90-95",
abstract="In 1970 a review was conducted of research and evaluation studies that analyzed some 57 highway-related safety countermeasures. As a result of that review only eight countermeasures were identified for which good to excellent estimates of effectiveness had been made. Although for most safety countermeasures it is known whether the countermeasure is better than nothing, it is often not known under what condition a countermeasure is most effective or how effective. Reviewed in this paper is what is known about the effectiveness of various safety countermeasures, as well as what is not known. Countermeasures discussed include various roadside hardware devices as well as geometric features. The reasons for the lack of knowledge are also discussed. This discussion focuses on the quality of safety evaluation studies and methods for improving the quality of these studies are recommended.<p /><p>Language: en</p>",
language="en",
issn="0361-1981",
doi="",
url="http://dx.doi.org/"
}