(A) SPEED HUMPS are generally 3-inch high, flat topped or cylindrical raised sections of pavement, typically 12 to 22 feet in length in the direction of travel. The ends of a speed hump are tapered to be flush with the street at the curb and gutter to allow water to drain. Speed humps are spaced roughly 250 to 750 feet apart, and have been proven to work by creating a vertical displacement of the vehicles traversing them. It should be noted that speed humps are not the typical speed "bump" frequently seen in parking lots.
(B) Installation of speed humps must strictly adhere to approved designs. A typical flat-top profile speed hump design is shown in Figure 1. Flat-top speed humps have been used successfully to diminish speeds on roads with high volumes. A typical cylindrical or Watt's Profile speed hump design is shown in Figure 2. Watt's Profile speed humps are generally limited for use on roadways with volumes no greater than 3,000 vehicles per day (vpd). In addition, advance warning signs must always be used in conjunction with speed humps; appropriate signing for flat-top speed humps is shown in Figure 1, while the typical signing for the Watt's Profile humps is shown Figure 2.
(Ord. 2000-01, passed 5-1-2000)