It means a speed hump also has a raised surface spread across the width of a road. The only difference is that the length of a speed hump is more than that of a speed bump, while its height is smaller than it. Speed humps are used in a road, driveway, or intersection where the traffic limit is 10 to 15 mph.. A speed bump is a low raised surface across the travel width of a roadway or pavement. Heights and lengths vary, but they usually feature small spaces on one edge between the device and the closed road so that drainage can happen. Speed bumps go by many names, including sleep breakers and traffic thresholds, and they have numerous purposes:

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Speed bumps encourage speed reduction to 2-10 mph. Speed bumps are more aggressive traffic calming options than speed humps, and so are useful in places where pedestrians and cars share space closely, like parking lots and driveways. A speed bump generally slows traffic to 2-10 mph, giving both people and cars time to react safely to one.. Say your target lane is standard width -- 12 feet or 144 inches. By choosing a four-piece speed bump (2 middle sections, 2 end caps), you can cover a 78-inch width, which is greater than the track width of a personal vehicle. Placing that 4-piece speed bump in the center of the road, leaves 33-inches of uninterrupted pavement on either side.