Effectiveness of traffic management in Salt Lake City, Utah

Journal of Safety Research
Wayne D CottrellH Joseph Perrin

Abstract

The effectiveness of speed humps, 14 ft (4.3 m) wide by 3.5 in (8.9 cm) high, and tables, 22 ft (6.7 m) wide, on 12 streets in Salt Lake City, Utah was investigated. Mean and 85th percentile spot speeds, speed limit compliance, motor-vehicle crashes, and resident opinions were considered. Spot speeds were collected at 18 "between-hump" locations. Motor-vehicle crash data were obtained for "before" and "after" periods of equal duration. A total of 436 residents were surveyed; 184 responded. The mean and 85th percentile speeds decreased at 14 and 15 locations, respectively. The average reduction in the 85th percentile speed (3.4 mph or 5.4 km/h) was significant in flat and rolling terrain, but not on uphill or downhill segments. The number of sites with 50% speed limit compliance increased from 4 to 12. The number of motor-vehicle crashes decreased from 10 to 9; the change was not significant, but injury crashes decreased from five to one. Regarding the residents, 30% were positive, 25% were negative, and 45% offered suggestions, some of which were conflicting. Further study is needed on speed hump spacing and speed tables in hilly terrain. Example results should be shared with residents to inform their decision-making. At least ...Continue Reading

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Citations

Dec 3, 2014·Journal of Safety Research·Anam Ardeshiri, Mansoureh Jeihani
Nov 28, 2012·Accident; Analysis and Prevention·Ana Tsui Moreno, Alfredo García
Oct 3, 2014·TheScientificWorldJournal·Amir FalamarziRiza Atiq O K Rahmat
Jul 9, 2008·Accident; Analysis and Prevention·Lawrence J CookLenora M Olson
May 9, 2013·International Journal of Injury Control and Safety Promotion·George YannisXenia Georgopoulou
Dec 7, 2007·Science and Engineering Ethics·Seumas Miller, Michael J Selgelid

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