Agenda - 09-02-2008 - 4e - Laserfiche WebLink

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C. SUBDIVISION PATTERNS Subdivisions are often structured around either a combination, or a modification of the following basic street patterns: gridiron, curvilinear, loop streets and Radburn Plan streets. These patterns are illustrated on the following page. Gridiron Pattern. The gridiron pattern evolved out of the government rectangular survey system. Featuring large lots, wide streets, and limited-use service alleys, the system works reasonably well up to a point; however, an overabundance of grid-patterned streets often results in monotonous neighborhoods, •with all lots facing busy streets. In addition, sidewalks are usually located adjacent to the streets, and the system provides for little or no open, park, or recreational space. Curvilinear Pattern. The curvilinear system integrates major arteries of travel with smaller secondary and cul-de- sac streets carrying minor traffic. In addition, small, open parks are often provided for at intersections. Loop Streets. By utilizing loop streets rather than a traditional grid pattern, a developer can provide residents with convenient pedestrian and auto access and attractive open space. Note that although the main streets are loosely patterned after the grid system, residential streets are all limited-access, with few lots facing the busier thoroughfares. Radburn Plan Streets. The Radburn Plan originated in the New Jersey town of the same name and features clusters of housing units grouped into large cul-de-sac blocks, often called "superblocks. " Pedestrian access and open space is provided for between each cluster, and pedestrian travel is well separated from auto traffic. Clustering for Open Space By slightly reducing lot sizes and clustering them around varying street patterns, a developer can house as many people in the same area as could be done using traditional subdividing plans, but with substantially increased tracts of open space. For example, compare the two following illustrations comparing a "conventional plan" to a "cluster plan." The first is a plan for a conventional designed subdivision containing 368 housing units.