Vehicle Speeds and Speed Humps - Empirical Data


This Portland Oregon site details the response of vehicles to speed humps from 31 different streets.

The data indicates that a 4 metre (14 foot) wide speed hump is effective at slowing traffic 150 m (500 feet) before the speed hump and 100 m (350 feet) after the speed hump. Elbow Park is installing 4 m wide speed humps throughout the community. Prior to placing speed humps the speeds were about 50 km/hr (32 mph). After placing speed humps speed 150 m before the hump decreased to 35-43 km/hr. At the hump speeds decreased to 25-35 km/hr. 100 m after the speed hum speeds had decreased to 35-43 km/hr.

Optimum speed hump placement is between 100 and 150 m spacing


Click the link below to see the data.


http://www.trans.ci.portland.or.us/trafficcalming/reports/driver.htm

Posted: Fri - October 24, 2003 at 07:08 AM      

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