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  2. Speed bump - Wikipedia

    en.wikipedia.org/wiki/Speed_bump

    While similar to speed bumps, humps are less aggressive than speed bumps at low speeds. Humps are often used on streets, while bumps are used more in parking lots. [ 20 ] While speed bumps generally slow cars to 10–15 km/h (5–10 mph), humps slow cars to 25–30 km/h (15–20 mph).

  3. Botts' dots - Wikipedia

    en.wikipedia.org/wiki/Botts'_dots

    Today, there are more than 25 million Botts' dots in use in California, [6] though they have started falling out of favor. In 2017, Caltrans announced that it would stop using Botts' dots as the sole indicator of lane division, due to cost and worker safety, and in order to make roadways more compatible with self-driving cars.

  4. Ride height - Wikipedia

    en.wikipedia.org/wiki/Ride_height

    A road car usually has a ride height around 16–17 cm (6.3–6.7 in), while an SUV usually lies around 19–22 cm (7.5–8.7 in). Two well-known extremes are the Ferrari F40 with a 12.5 cm (4.9 in) ride height [1] and the Hummer H1 with a 40.64 cm (16.0 in) ride height.

  5. What is a speed trap and are they legal in California? Here’s ...

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  6. Speed bumps don't work: New approaches challenge long-held ...

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    Speed bumps have limited effectiveness: They only modestly reduce average speeds and their impact is localized. Unintended consequences exist: Speed bumps can pose safety risks, increase noise ...

  7. The operator of Speed Bump Olympics, who posted his 99th video on Wednesday (an 11-minute, 49-second clip entitled “Speed Bump Fails 55”), also placed the blame on drivers.

  8. Actibump - Wikipedia

    en.wikipedia.org/wiki/Actibump

    An Actibump is an automatic speed-bump on a road. It is a product developed by the Edeva AB group, a Swedish traffic systems manufacturing company. It is triggered when a speeding vehicle drives over an activated piece of the road, causing a change in the level of the road as a warning to the driver. [1]

  9. International roughness index - Wikipedia

    en.wikipedia.org/wiki/International_roughness_index

    A major issue with the profilers has to do with their contact areas compared to the footprint of a tyre. The latter is much larger than any of the static/slow speed Class 1 profilers or a typical laser profilometer. This can be addressed with a 4-inch or 6-inch line laser mounted in the wheelpaths to mimic the tire patch width.

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