For the speed changes in cinematography, see Speed ramping. Variations include the speed hump, speed cushion, and speed table. Although speed bumps are effective in keeping vehicle speeds down, their use is sometimes controversial—as they can reservation policy in india advantages disadvantages pdf traffic noise, may damage vehicles if traversed at too great a speed, and slow emergency vehicles.
Many sports cars have this problem with such speed bumps. Speed bumps can also pose serious hazards to motorcyclists and bicyclists if they are not clearly visible, though in some cases a small cut across the bump allows those vehicles to traverse without impediment. 200 and may need replacement over time due to wear.
Each of these devices can be made from a variety of materials, including asphalt, concrete, recycled plastic, metal, or vulcanized rubber. Several trade-offs must be made when selecting the material for a new speed cushion. Traditionally most vertical deflection devices have been constructed of asphalt or concrete.
Due to the rigidity and durability of these materials, they have more permanence and are more effective at slowing traffic. However, they can be difficult to shape and form into consistent forms and precise dimensions. Rubber products are pre-shaped to standard sizes to meet industry standards.
Preformed rubber products are typically bolted down, making them easier to install or remove. Temporary bolt-down installations can be ideal for planners in testing the use and positioning of speed bumps before implementing them in a larger project. Bolt-down products can also be removed or relocated during winter snow periods—where speed bumps are easily concealed and may be damaged by snowplows. On June 7, 1906, The New York Times reported on an early implementation of what might be considered speed bumps in Chatham, New Jersey, which planned to raise its crosswalks five inches above the road level: “This scheme of stopping automobile speeding has been discussed by different municipalities, but Chatham is the first place to put it in practice”.