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speed bump中文

The aim of the speed hump is to slow motor vehicle traffic to a safe speed, as the ramps become uncomfortable for vehicle drivers if they are driven over too fast.

44% reduction in accidents is taken from Mountain, Hirst and Maher (2005). The study calculated accident reductions from various different types of traffic calming measures. Local authority and police data were used throughout Great Britain from 150 speed management schemes on 20 mph roads. Analysis is particularly strong, with correction for change in flow, accident trend and regression to mean.

Factors associating reduced motor vehicle speed to road safety are based around Wilson et al. (2010), who note the large body of research consistently linking casualty rate with speed (e.g. TRL 421).

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Traffic calming

Taylor, M., Lyman, D., Baruya, A. (2000) The effects of drivers - speed on the frequency of road accidents (TRL421). Transport Research Laboratory. Crowthorne, UK.

Motor vehicles are likely to travel at around 15 mph over a speed hump. If there's a series of speed humps, vehicles are likely to travel at 20 mph between them.

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Speed bump

A clear colorless to light amber liquid with a petroleum odor. Flash point 100°F. Less dense than water and insoluble in water. Vapors are heavier than air.

Speed humps do not slow motor vehicle traffic as much as speed tables, however they are more effective than speed cushions.

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Speed table

Webster, D. & Layfield, R. (1996) Traffic calming - road hump schemes using 75mm high humps (TRL186). Transport Research Laboratory. Crowthorne, UK.

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Winnett, M. & Wheeler, A. (2002) Vehicle-activates signs - a large scale evaluation (TRL548). Transport Research Laboratory. Crowthorne, UK.

Warning sign with yellow and black triangle with exclamation mark, on blue background. Danger, risk, caution, attention, road sign and care concept.

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Likely motor vehicle speeds when travelling over a speed hump are taken from TRL report 186 (Webster & Layfield, 1996). The research was based on Local Authority data at thirty-three 75mm high round-top humps from around England. All sites had a 30 mph speed limit except four, which had 20 mph speed limits. The speeds between humps is based on an average separation of 90m between the devices, with an 85th percentile speed of 26mph. Overall, the quality of this study is very poor . there is no methodological detail given, including any use of control sites, or before/after data collection periods. In the absence of other, specific analysis on round-top humps, this paper is used as a guide for effects on speed.

Mountain, L., Hirst, W., Maher, M. (2005) Are speed enforcement cameras more effective than other speed management measures? The impact of speed management schemes on 30 mph roads. Accident analysis and prevention 37 pp. 742 . 754.

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Wilson, C., Willis, C., Hendrikz, JK., Le Brocque, R., Bellamy, N. (2010) Speed cameras for the prevention of road traffic injuries and deaths (Review). The Cochrane Collaboration. John Wiley & Sons.