A speed hump (also called a road hump or undulation, and in Ireland called a speed ramp) is a rounded traffic calming device used to reduce vehicle speed and volume on residential streets. Humps are placed across the road to slow traffic and are often installed in a series of several humps in order to prevent cars from speeding before and after the hump. Common speed hump shapes are parabolic, circular, and sinusoidal.
Generally, speed humps are 12 to 14 feet (3.7 to 4.25 m) in length and span the width of the road. The height of humps ranges from 3 to 4 inches (7.5 to 10 cm). The length and height of the speed humps determine the speed at which traffic will travel over the devices. Shorter lengths and greater heights slow cars most drastically. When placed in a series 350–550 feet (100–170 m) apart, humps will reduce 85 percentile speeds by 8–10 mph (13–15 km/h).
A warning sign notifies motorists before humps. Humps generally have pavement markings to enhance visibility and a taper edge near the curb to allow a gap for drainage.
Speed humps are used in locations where very low speeds are desired and reasonable. Speed humps are typically placed on residential roads and are not used on major roads, bus routes, or primary emergency response routes. Placement is generally mid-block between intersections.
Occasionally, there is an increase in traffic noise from braking and acceleration of vehicles on streets with speed humps, particularly from buses and trucks. Other effects include increased vehicle fuel consumption and emissions – as most fuel injection systems in modern internal combustion engines operate in open-loop mode (fuel rich) when accelerating – as well as increased wear and tear on brakes, engine and suspension components.
Damage caused by snow plows during the winter months is an additional concern.
A DUBLIN Bus driver injured when the pneumatic suspension on his vehicle failed as he drove over a speed ramp has been awarded nearly '76,000 in High Court damages.
Jun 05, 2010; Bus driver injured on speed ramp wins '76,000 Tim Healy A DUBLIN Bus driver injured when the pneumatic suspension on his vehicle...
Wipo Publishes Patent of Compagnie Generale Des Etablissements Michelin, Clare Baritaud, Vincent Pelissier, Patrick Gougnaud, Nicolas Bard, Michelin Recherche et Technique for "Method of Measuring Capillary Rheology by Speed Ramp" (French Inventors)
Oct 31, 2012; GENEVA, Oct. 31 -- Publication No. WO/2012/143196 was published on Oct. 26. Title of the invention: "METHOD OF MEASURING...