Speed humps or speed bumps
Despite the similar names, speed humps and speed bumps are not interchangeable—they are distinct in their performance. Both use a 2-4 inch rise to force drivers to reduce their speed. Speed bumps have a much shorter travel distance than speed humps and create a more aggressive jolt for the driver.
Speed bumps measure up to 6 feet long, forcing serious speed reduction. Vehicles’ front wheels pass over the bump entirely before the rear.
Speed hump benefits
Speed humps are intended to reduce driver speeds down to 10—15 miles per hour over the hump, and 25-30 miles per hour between humps in a series. They should be arranged to avoid disruption of cycling lanes and on-street parking.