This study conducted a before–after evaluation by means of the empirical Bayes methodology for four types of treatments at signalized intersections with data from Winston-Salem, North Carolina. The results indicated that changing to protected left-turn phasing from permissive or permissive–protected phasing could lead to a virtual elimination of left-turn crashes but other crashes, which were likely to be less severe, could increase. Conversion from nighttime flashback to regular phasing seemed effective in reducing nighttime crashes. Replacing 8-in. signal heads with 12-in. heads seemed effective in reducing right-angle crashes, but this measure could increase other, less-severe crashes. Adding another red-signal lens to an existing one or changing from permissive to permissive–protected left-turn phasing did not seem particularly effective in reducing crashes, but these results were not definitive because they were based on a limited number of sites. Further research using data from other jurisdictions is needed, so that more definitive conclusions can be made about the safety effectiveness of these treatments.
Safety Effectiveness of Selected Treatments at Urban Signalized Intersections
Transportation Research Record
Transportation Research Record: Journal of the Transportation Research Board ; 2056 , 1 ; 70-76
2008-01-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Safety Effectiveness of Selected Treatments at Urban Signalized Intersections
Online Contents | 2008
|Safety Treatments at Isolated High-Speed Signalized Intersections: Synthesis
Online Contents | 2007
|Safety Treatments at Isolated High-Speed Signalized Intersections: Synthesis
British Library Online Contents | 2007
|Safety effectiveness of converting signalized intersections to roundabouts
Online Contents | 2013
|