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<br />. <br /> <br />. <br /> <br />B. <br /> <br />. <br /> <br />Pavement Management Program <br />Standards Discussion Points <br /> <br />A. Street Widths <br />Staff Recommends a range of widths depending on street function, refer to the <br />colorized citymap for breakdown: <br />1. Collector/State Aid Routes - 32 feet (shown as green on citymap) <br />These streets generally provide for greater numbers of vehicles and <br />pedestrians/bicyclists, the striping of 4' shoulders to provide a narrowing <br />effect for drivers while delineating a walking/biking area should be <br />considered with these streets. State Aid rules would allow street widths as <br />narrow as 26 feet. <br />2. Local Residential Streets - 28 feet (shown as blue on citymap) <br />These streets are through streets but generally are circuitous in nature or <br />serve fewer persons than the Collector/State Aid routes. <br />3. Cui de Sacs and Special Cases- 24 feet (shown as purple on citymap) <br />These streets serve very few residents and no through traffic. 24 feet is the <br />nan'owest desirable width from city maintenance perspective. <br /> <br />Street Cross Section <br />1. Bituminous Smfacing: 4 inches of bit surfacing placed in two lifts over an <br />aggregate base is rccommended standard. This design will provide for 9 <br />ton roadway capacity at the traffic volumes typically present throughout <br />the city residential streets. <br />2. Sand Subbase: A 12 inch thick underlayment of sand material below the <br />bituminous/aggregate base is recommended to provide a drainage course <br />below the street. Key to this provision is to provide subdrainage pipe <br />within the sand subbase layer that are connected to the storm sewer system <br />or outletted to ditches as appropriate. This design helps keep moisture out <br />of the roadway base and therefore adds considerable strength to the <br />pavement section and longevity by reducing the damage normally caused <br />during spring melting conditions. <br />3. Concrete Curb and Gutter: Concrete Curb and Gutter provides <br />. a stable maintenance edge for plowing and sweeping <br />. protect the edges of the bituminous surfacing from raveling <br />. reduce erosion from boulevards/lawns <br />. reduce plow damage to yards, mailboxes <br />. channel storm water runoff away from street <br />Curbs can be constructed in many different shapes, heights and colors. B <br />type curb is preferred for maintenance purposes, D type curb <br />(surmountable) is more bike and pedestrian friendly (provides easier <br />egress from street if necessary to avoid traffic); Colored curb may provide <br />a more subdued curb but would typically cost about 5$-6$ extra per foot <br />