Speed Humps
Design Speed humps are typically 3–4 inches high and 12–14 feet wide . The ramp length (the sloping part) of a speed hump is usually 3–6 feet , depending on the desired target speed reduction. They are often referred to as “bumps” on signage and by the general public. Slopes should not exceed 1:10 or be less steep than 1:25 . Side slopes on tapers should be no greater than 1:6 . The vertical lip (the raised part) should be no more than a quarter-inch high. Locate speed humps where there is sufficient visibility and available lighting. Spacing between speed humps should be determined based on the target speed of the roadway. Generally, they should be spaced no more than 500 feet apart to achieve an 85th percentile speed of 25–35 mph . To achieve greater speed reductions, space speed humps close together. Speed humps can be applied on one-way or two-way roads Placement and Considerations : Speed humps should not be placed in front of driveways or other significant access a