“SPEED BUMP.” Single asphalt bumps covering approximately one (1) foot and approximately five (5) inches in height. Found in shopping centers and parking lots. Not installed on public streets.
“SPEED HUMP.” Single asphalt hump, parabolic in shape, covering twelve (12) feet of street with a height between three and one-quarter (3 1/4) and three and three-quarters (3 3/4) inches.
“SPEED LUMPS.” Asphalt mounds, parabolic in shape, covering twelve (12) feet of street with a height between three and one-quarter (3 1/4) and three and three-quarters (3 3/4) inches. The center mound or lump, has a width of five and one-half (5 1/2) feet to accommodate the wheelbase of fire trucks and buses. The lumps adjacent to the center lump vary in width to accommodate the street width. Depending on the street width, a five and one-half (5 1/2) foot lump may be placed in each travel lane.
“SPEED SURVEY.” A survey of traffic speeds and volume conducted by the use of a magnetic sensor(s) or air pressure hoses to determine the percentage of traffic exceeding the speed limit. The speed survey shall be twenty-four (24) hours in length.
“UNDULATIONS.” A set of adjacent speed humps placed on the street.
“85th PERCENTILE SPEED.” Otherwise known as the critical speed, is the speed at or below which 85% of the traffic is moving. The 85th percentile speed is used as one of the criteria to determine if a street qualifies for speed humps.
(Ord. 2004-O-07, passed 4-5-04)