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The following standards shall be met in all new residential development in order to increase connectivity:
(A) Street Connectivity
Any residential development shall be required to achieve a connectivity index of 1.2 or greater unless the Planning Director determines that this requirement is impractical due to topography, existing development, and/or natural features. In the event that this requirement is waived, a six-foot pedestrian trail shall be provided to link any cul-de-sacs within a residential development in which the required connectivity index has been waived. A connectivity index is a ratio of the number of street links (road sections between intersections and cul-de-sacs) divided by the number of street nodes (intersections and cul-de-sac heads). The following illustration provides an example of how to calculate the index. Street links on existing adjacent streets that are not part of the proposed subdivision are not included in the connectivity index calculation.
NOTE: The measure of connectivity is the
number of street links
divided by the number of nodes. Nodes exist at street intersections
as well as cul-de-sac heads.
Links are the stretches of road that connect nodes. Stub outs shall also
be considered as links. In
this example, there are five (5) links (circles) and four (4) nodes
(stars); therefore, the connectivity index is 1.25.
(B) Street Arrangement
(1) The proposed public or private street system shall be designed to provide vehicular interconnections to facilitate internal and external traffic movements in the area. Such connections shall be provided during the initial phase of the project approximately every 1,250 to 1,500 linear feet for each direction (north, south, east, west) in which the subject property abuts. If the common property boundary in any direction is less than 1,250 linear feet, the subject property will be required to provide an interconnection if it is determined by the Planning Director that the interconnection in that direction can best be accomplished through the subject property. When the Planning Director deems a vehicular connection impractical, he/she can increase the length requirement and/or require pedestrian connections. The Planning Director may delay the interconnection if such interconnection requires state approval or will result in significant hardship to the property owner. The intent of this standard is to improve access/egress for Town neighborhoods, provide faster response time for emergency vehicles, and improve the connections between neighborhoods.
(2) Any development of more than 100 residential units or additions to existing developments such that the total number of units exceeds 100 shall be required to provide vehicular access to at least two public streets unless such provision is deemed impractical by the Planning Director or Town Engineer due to topography, natural features, or the configuration of adjacent developments.
(3) Where new development is adjacent to vacant land likely to be divided in the future, all streets, bicycle paths, and access ways in the development’s proposed street system shall continue through to the boundary lines of the area under the same ownership as the subdivision, as determined by the Planning Director or the Town Engineer, to provide for the orderly subdivision of such adjacent land or the transportation and access needs of the community. In addition, all redevelopment and street improvement projects shall take advantage of opportunities for retrofitting existing streets to provide increased vehicular and pedestrian connectivity.
(4) In general, permanent cul-de-sacs and dead-end streets are discouraged in the design of street systems, and should only be used when topography, the presence of natural features, and/or vehicular safety factors make a vehicular connection impractical. Where cul-de-sacs or dead-end streets are unavoidable, site and/or subdivision plans shall incorporate provisions for future vehicular connections to adjacent, undeveloped properties, and to existing adjacent development where existing connections are poor.
(5) Permanent dead-end streets or cul-de-sacs shall comply with the length limits and design standards set forth in the Town’s Standard Specifications and Details Manual, and shall be provided with a turnaround at the closed street end.
(C) Cross Access
All non-residential development shall be designed to allow for cross-access to adjacent properties to encourage shared parking and shared access points on public or private streets. A minimum distance of 100 feet shall be required between a cross-access way and an intersection or driveway entrance. When cross-access is deemed impractical by the Planning Director on the basis of topography, the presence of natural features, or vehicular safety factors, this requirement may be waived provided that appropriate bicycle and pedestrian connections are provided between adjacent developments or land uses. A cross access easement must be recorded prior to issuance of a Certificate of Occupancy for the development.
Cary, NC Land Development Ordinance On-line VIC Version - This site last updated 3/4/2008
Note: This is not the official version of the Cary Land Development Ordinance