(B) Traffic control calming features. The following provisions describe and establish standards for permitted traffic calming devices where traffic calming measures are permitted as part of the roadway design elements in subsection (A) above. The descriptions below are described in the document entitled Traffic Calming: State of the Practice. Traffic calming options for local streets are noted in Table 153.1078(A) below.
(C) Maintenance. Maintenance of landscaping associated with traffic calming features shall be the sole responsibility of the HOA.
Median islands: These are raised, circular landscaped areas located within non-intersection, midblock locations. Median islands channelize traffic and separate opposing flows. Traffic must slow down to maneuver around a median island. Median islands offer landscaping opportunities and maintenance responsibility. Median islands can be used to protect existing trees. |
Neckdowns/flares/street narrowing/intersection throating: Neckdowns are curb extensions at intersections that reduce roadway width curb to curb. They are sometimes called slow points, nubs, bulbouts, knuckles or intersection narrowing. These traffic control measures reduce the width of a section of roadway in a gradual manner. They shorten crossing distances for pedestrians and draw attention to pedestrians via raised peninsulas. By tightening curb radii at the corner, the pedestrian crossing distance is reduced and the speeds of turning vehicles are reduced. The effect of this measure is to reduce speed and discourage non-local traffic. Motorists react to this measure with slower speed because of a concern of a limited travel path. |
Roundabouts/traffic circles: These are raised circular structures constructed at a three-or four-way intersection. Their objectives are to slow speeding and reduce the number and severity of vehicular accidents. This measure is most suitable for wide intersections and may accommodate all sizes of vehicles by applying appropriate engineering designs. |
Speed humps: These are raised pavement features constructed across the width of the street. The speed hump shall be 3 inches high and 12 feet long from the leading edge to the trailing edge. This feature discourages motorists from speeding and encourages them to obey the posted speed limit. When speed humps are constructed, advisory signs shall be installed to notify motorists of the speed hump and an appropriate advisory travel speed. |
“T” intersections: These are located at grade intersections where one of the intersecting street links is perpendicular to the other two. Traffic must slow down to negotiate the turning maneuvers in a “T” intersection. This roadway feature is very common. Motorists are familiar with T intersections. |
(Ord. 3020, passed 9-10-2013, § 5.23.14)