Technical Considerations [Autosaved].pptx

Technical Considerations

Quezada, Rheiane Pearl J.

Streets

are usually crowned in the center for positive drainage and may utilize a curb and gutter system or roadside swale to channel surface runoff to an outfall and to act as a visual and physical barrier between vehicular and pedestrian spaces.

curb and gutter system

roadside swale

Curbing is usually 6 inches(0.152m) high, although a 4-inches(0.101m) rolled curb is sometimes used.

Grassed swales can be found in areas with low-density development.

Pavement

width varies; however, 24(7.31m) to 30 feet(9.14m) from curb to curb is common for a 50-foot(15.2m) right-of-way. A right-of-way of this width usually allows parking on one side of the street, and a 60-foot(18.2m) right-of-way allows parking on both sides of the street.

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Streets

are laid out using a system of horizontal and vertical curves. Depending on the right-of-way width and design speed of the road, the minimum centerline radius of a horizontal curve can vary from 75 feet(22.8m) for a 50-foot(15.2m) right-of-way to 250 feet(76.2m) for some state-maintained highways. Vertical curves provide positive drainage and enable the designer to adapt a road to topographic conditions.

Broken-back curves and Reverse curves

are usually designed with at least a 100-foot(30.4m) tangent or straightaway between them to allow recovery time for the motorist and additional braking space. Broken-back curves

reverse curves

Intersections

should intersect at right angles, but many cannot. It is considered unsafe, however, to design an intersection with less than 30 degrees of deflection. Also, intersections should be either directly opposite one another or at least 125 feet(38.1m) apart from centerline to centerline.

Cul-de-Sacs

Cul-de-Sacs

• These are usually required for school buses, fire trucks, and garbage trucks, but should actually be considered on a case-by-case basis to allow flexibility and interest in the land plan.

• In TNDs, cul-de-sacs are rarely used because they prevent connectivity.

• If cul-de-sacs must be used, pedestrian and bicycle access should be provided through the dead end of the street to allow connections to the neighborhood street beyond.

• In CSDs, cul-de-sac lengths vary, but generally should not exceed 1000 feet in length. The right-of-way dedication of cul-de-sac bulbs or turnarounds is usually required to be 100 feet(30.4m) in diameter with an 80-foot(24.3m) curb diameter.

Cul-de-Sacs

Traditional Neighborhood Development (TND) Conventional Suburban Development (CSD)

CSD typically include separated land uses, where housing, retail, office and industrial uses are isolated from one another.

TND. Land uses are mixed, with retail, office, civic buildings and residential interwoven throughout the community, and many times located in the same buildings.

Trumpet intersections

are an at-grade solution, allowing some traffic to continue to move even when through traffic is stopped by traffic signals. They can also aid in creating a sense of place by providing space for entrance icons, landscaping, and water features.

Rotaries

Rotaries

• Like trumpets, are good place makers.

• They allow single-way movement around a center island (a focal point) and do not require signalization at lower traffic counts.

• Useful for intersections of 500 to 1000 trips per hour.

• Work well in residential areas, especially if the center area becomes a landscaped park.

• End…

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