ITE Journal - May 2020 - 45

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TOOL

Developing, Using, and Improving Tables
Showing the Safest Feasible Intersection Design

I

By Joseph E. Hummer, P.E., Ph.D. (M)
n recent years, the Federal Highway Administration (FHWA) and the states have
invested millions of dollars in research on the safety performance of different measures
at intersections. Much of this research has been cataloged in an easy-to-use website
called the "Crash Modification Factors Clearinghouse"1 maintained by the FHWA. The

Clearinghouse contains thousands of crash modification factors (CMFs), which are defined as
the ratio of the estimated crash frequency after an intervention to the crash frequency before the
intervention. A CMF below one thus means the intervention helped. Happily, researchers have
rated the quality of each CMF in the Clearinghouse, on a scale of zero stars (poor or unknown
quality, result should not be trusted) to five stars (excellent quality, trustworthy result), so that
consumers of the information do not have to make that judgment. The library of CMFs, each
with a quality rating, is a tremendous resource.
w w w .i t e.or g

May 2020

45


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ITE Journal - May 2020

Table of Contents for the Digital Edition of ITE Journal - May 2020

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https://www.nxtbook.com/ygsreprints/ITE/ITE_Dec2020
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https://www.nxtbook.com/ygsreprints/ITE/G110110_ITE_October2019
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https://www.nxtbook.com/ygsreprints/ITE/G107225_ITE_June2019
https://www.nxtbook.com/ygsreprints/ITE/G104039_ITE_May2019
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https://www.nxtbook.com/ygsreprints/ITE/G100155_ITE_December2018
https://www.nxtbook.com/ygsreprints/ITE/G100154_ITE_November2018
https://www.nxtbook.com/ygsreprints/ITE/G99495_ITE_October2018
https://www.nxtbook.com/ygsreprints/ITE/G98028_ITE_September2018
https://www.nxtbook.com/ygsreprints/ITE/G97366_ITE_August2018
https://www.nxtbook.com/ygsreprints/ITE/G96287_ITE_July2018
https://www.nxtbook.com/ygsreprints/ITE/G94315_ITE_June2018
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