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A crash cushion installed on a motorway exit in Italy. An impact attenuator, also known as a crash cushion, crash attenuator, or cowboy cushion, is a device intended to reduce the damage to structures, vehicles, and motorists resulting from a motor vehicle collision. Impact attenuators are designed to absorb the colliding vehicle's kinetic energy.
If a product is on a large load-bearing area, the cushion may not deform and will not cushion the shock. If the load-bearing area is too small, the product may “bottom out” during a shock; the shock is not cushioned. Engineers use “cushion curves” to choose the best thickness and load-bearing area for a cushioning material.
Chrome plated front bumper on a 1958 Ford Taunus Rear bumper with integrated tail lamps and a rubber-faced guard on a 1970 AMC Ambassador. A bumper is a structure attached to or integrated with the front and rear ends of a motor vehicle, to absorb impact in a minor collision, ideally minimizing repair costs. [1]
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Speed bumps can also have adverse environmental impact. A study found that in one north London street with a speed limit of 20 miles per hour (32 km/h; 8.9 m/s) and fitted with road humps, a petrol driven car produced 64 per cent more nitrogen dioxide (NO 2) than in a similar 20 miles per hour (32 km/h; 8.9 m/s) street fitted with road cushions.
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