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Speed cushions

Road humps, and in particular speed cushions, are one of the most cost-effective means of reducing vehicle speeds in urban areas.​

Road humps can reduce average speeds typically by 10mph and are particularly effective at reducing child pedestrian casualties.

Success in South Gloucestershire

According to a study carried out by the council in 2004, speed cushions in South Gloucestershire have been successful in reducing accident numbers. The study shows that accident numbers have dropped by as much as 61% in areas where speed cushions have been introduced.
All the speed cushion schemes highlighted by the study were introduced in areas where there was a proven accident problem. In some cases, the introduction of speed cushions reduced the number of accidents to zero in the three years after they were introduced.

Designing speed cushion schemes

Schemes are designed to encourage a smooth driving style and to limit noise and emissions. There is no evidence that, when negotiated at sensible speeds, they cause damage to vehicles, or injury to their occupants.

National regulations allow the use of full width road humps up to 100mm in height. However, in response to concerns raised by the emergency services and bus companies, the Transport Research Laboratory developed the speed cushion.

Fire appliances, ambulances and buses are able to straddle the cushions whilst other vehicles are still forced to reduce their speed.

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