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Thread: Need info on Multiple Points of Access and Connectivity

  1. #1
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    Need info on Multiple Points of Access and Connectivity

    Does your City/County require multiple points of access for new subdivisions over a certain number of lots? If so, can you provide me with a general summary of the requirements or a link to your regulations online?

    I am also interested in jurisdictions that set a minimum connectivity index and/or require streets to stub into adjacent undeveloped properties for future interconnectivity.

    The Chatham County-Metropolitan Planning Commission is currently dealing with these issues and has requested information on how other jurisdictions are handling these topics.

    Thanks for your help!

  2. #2
         
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    Our standard is no more than 25 units on a single point of entry with typical single-family detached homes. With every unit sprinkled then we allow no more than 50 units on a single point of entry.

    We require street stubs into adjacent properties with development potential unless there is some natural feature that prevents it. We have a Transportation Master Plan that we use for arterials and collectors and we have to use our best judgement for local streets.

  3. #3
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    Method of determining # of lots

    Thanks for the information.

    How did your jurisdiction arrive at the number 25 for requiring multiple points of access? It seems low relative to the research we've done on other cities (75, 100, 200).

    Your standard seems to be based on the accessibility of the homes by the Fire Dept. Our concerns are more oriented toward instances where an access to a subdivision may be blocked.

  4. #4
    Cyburbian Wildono's avatar
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    Quote Originally posted by Amanda Bunce View post
    Does your City/County require multiple points of access for new subdivisions over a certain number of lots? If so, can you provide me with a general summary of the requirements or a link to your regulations online?

    I am also interested in jurisdictions that set a minimum connectivity index and/or require streets to stub into adjacent undeveloped properties for future interconnectivity.

    The Chatham County-Metropolitan Planning Commission is currently dealing with these issues and has requested information on how other jurisdictions are handling these topics.

    Thanks for your help!

    Cary, NC has a connectivity ordinance that includes an index which references a ratio of street segments to intersection nodes. Kent, WA requires connectivity for peds on culs-de-sac if vehicular connectivity is infeasible - due to critical areas - such as a ravine at the end of a planned c-d-s subdivision. Certain design features are also associated with connectivity in the Kent ordinance. Not sure the draft transportation master plan will include a street plan - which would be most desirable from a connectivity planning perspective.

  5. #5
    Cyburbian jmello's avatar
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    See 7(f) for the surrounding county's connectivity formula:

    http://www.nhcgov.com/PLN/ord/subdiv...d5.asp#Sect_40

    "All proposed streets shall be continuous and connect to existing or platted streets without offset with the exception of cul-de-sacs as permitted and except as provided below. The street network for any subdivision shall achieve a connectivity ratio of not less than 1.40. (See Example Fill In later) The phrase "connectivity ratio" means the number of street links divided by the number of nodes or link ends, including cul-de-sac heads. A "link" means and refers to that portion of a street defined by a node at each end or at one end. Approved stubs to adjacent property shall be considered links. However, alleys shall not be considered links."

    MODS: This should be moved to LUZDC or Transportation Planning, no?

  6. #6
    Cyburbian Jeff's avatar
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    Job I'm working on now is 30. If sprinklered, unlimited.

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