TEMPORARY SPEED HUMP IMPACT EVALUATION

The main objective of this research was to evaluate the impact of temporary speed humps and speed tables on vehicle speeds, vehicle speed profiles, and traffic volumes along local and/or collector streets in several rural Iowa cities. A 25 mile per hour (mph) temporary speed hump and a 30 mph temporary speed table, both made of recycled rubber, were purchased to test the impact of temporary devices. Two cities volunteered and the speed hump/table was installed on two test streets on the city of Atlantic and one test street in the city of Le Claire. The speed hump was installed first and then converted to a speed table. Each device was installed for a period of at least two weeks at the same location. Speed, volume, and resident opinion data were then collected and evaluated. In general, the devices were shown to be effective with the temporary speed table performing as well or better than the speed hump. Both the speed hump and the speed table were effective in reducing mean speeds at the device and immediately downstream, while speeds immediately upstream and farther downstream were less likely to be affected. The speed hump and speed table also reduced the number of vehicles exceeding the speed limit in the immediate vicinity of the devices.

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