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Speed sensitive road hump rewards slower drivers

A REVOLUTIONARY speed-sensitive road hump has completed successful trials at transport research body TRL's Berkshire test track.

Developed originally by Dunlop, the design is now owned by consultant Pell Frischmann.

At the heart of the Transcalm units are patented air valves that allow air to escape from the hump at an adjustable rate.

When vehicles cross the hump at or below the posted speed limit, the air has time to escape and the vehicle occupants feel little discomfort.

At higher speeds the ramp remains partially air filled, producing much the same effect on the car as the traditional road hump. The Transcalm device is claimed to be safer, quieter and produce much less vibration.

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