Document Detail

Safety effects of unsignalized superstreets in North Carolina.
MedLine Citation:
PMID:  22269544     Owner:  NLM     Status:  In-Data-Review    
Arterials across the United States are experiencing far too many collisions. Agencies tasked with improving these arterials have few available effective solutions. Superstreets, called restricted crossing u-turns by the Federal Highway Administration (FHWA), are part of a menu of unconventional arterial intersection designs that may provide a promising solution. Up to this point, there is little valid information available on the safety effects of superstreets, as study results have been from basic analyses that only account for traffic volume changes. The purpose of this research was to determine the safety effects of the unsignalized superstreet countermeasure on existing arterials in North Carolina. The safety study involved traffic flow adjustment, comparison-group, and Empirical Bayes analyses of 13 unsignalized superstreet intersections in North Carolina. The superstreets have been installed in the last few years across the state as opportunities presented themselves, but not necessarily at the most hazardous sites. The unsignalized superstreet countermeasure showed a significant reduction in total, angle and right turn, and left turn collisions in all analyses. Analyses also showed a significant reduction in fatal and injury collisions. The authors recommend that future analysts use a crash modification factor of 46 percent when considering the conversion of a typical unsignalized arterial intersection into a superstreet.
Sarah E Ott; Rebecca L Haley; Joseph E Hummer; Robert S Foyle; Christopher M Cunningham
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Publication Detail:
Type:  Journal Article     Date:  2011-10-27
Journal Detail:
Title:  Accident; analysis and prevention     Volume:  45     ISSN:  1879-2057     ISO Abbreviation:  Accid Anal Prev     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-01-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1254476     Medline TA:  Accid Anal Prev     Country:  England    
Other Details:
Languages:  eng     Pagination:  572-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Department of Civil, Construction, and Environmental Engineering, 208 Mann Hall, North Carolina State University, Raleigh, NC 27695-7908, USA.
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