This section shall apply only to that development which occurs in the subdivision of land along private streets and, furthermore, the development must comply with the provisions herein referred to in this section.
(A) Street design.
(1) Widths. The private street shall have a right-of-way of not less than 60 feet, except that a right-of-way of 50 feet will be permitted if a reduced width is essentially unavoidable and is approved by the Planning Board.
(2) Cul-de-sacs. The required turnaround on a dead end private street in a hillside subdivision shall have a roadway diameter of not less than 50 feet and a right-of-way diameter of not less than 60 feet. If the street length does not exceed 300 feet and if construction difficulties will not permit a turnaround, the use of a “Y” or “T” or other turning space of a design such as will allow a vehicle with a wheel base of at least 20 feet to complete a turning movement with a maximum of one backing movement, may be permitted if approved by the Planning Board.
(3) Grading. Grading will not be required for the full right-of-way in hillside subdivisions if the Planning Board determines that full grading will prevent convenient access to adjoining property or will destroy the natural beauty of the site by excessive cut and fill; however, where slope extends beyond right-of-way, add slope easement where needed. Easement to extend ten feet beyond top of cut where it exceeds 15 feet.
(4) Street grades. In hillside land subdivisions, maximum private street grades permitted shall be 20% unless the Planning Board determines that a steeper grade is essentially unavoidable and would not create excessive danger.
(B) Street improvements for Hillside Subdivisions.
(1) Pavement widths where required. Pavement widths shall not be less than 20 feet except for designated interior streets or where the average cross slope is 16% or greater, pavement widths may be reduced with Planning Board approval as follows.
(a) Where the average cross slope is between 16% and 40%, minimum pavement width may be reduced to 18 feet.
(b) Where the average cross slope is greater than 40%, approval of the district engineer of the State Highway Commission shall be secured prior to any road construction. Evidence of such approval shall be shown on the preliminary plat.
(c) Where pavement width is reduced, the more stringent requirements shall apply.
(2) Sixteen to 25% cross slope. When the average cross slop is between 16% and 25%, design requirements for lot are as follows.
(a) The average minimum lot area for the entire subdivided area will be 15,000 square feet. No less than 80% of the lots shall have a minimum area of 15,000 square feet, and no lot shall have an area of less than 15,000 square feet.
(b) Minimum lot frontage will be 70 feet except a minimum frontage of 45 feet may be permitted at the end of a cul-de-sac.
(c) Minimum average lot width wilt be 70 feet.
(3) Twenty-six to 40% cross slope. When the average slope is between 26% and 40%, design requirements for lots are as follows.
(a) The average minimum lot for the entire subdivided area will be 25,000 square feet. Not less than 80% of the lots shall have a minimum area of 28,000 square feet, and no lot shall have an area of less than 15,000 square feet.
(b) Minimum lot frontage will be 100 feet, except a minimum of 50 feet may be permitted at the end of the cul-de-sac.
(4) Cross slope greater than 40%. When the average cross slope is greater than 40%, design requirements for lots are as follows.
(a) The average minimum lot area for the entire subdivided area will be one acre. Not less than 80% of the lots shall have a minimum area of 48,000 square feet, and no lot shall have an area less than 25,000 square feet.
(b) Minimum foot frontage of 60 feet may be permitted at the end of a cul-de-sac.
(c) Minimum average lot width will be 130 feet.
(5) Panhandle lots. The Planning Board may approve panhandle lots in exceptional cases where it is unpractical to serve an isolated lot by a public street. The frontage of the panhandle lot shall have a minimum width of 25 feet providing an access strip between two regular lots to the isolated building site. The area of such strip shall be excluded in computing the lot area and width, and the length of said strip shall not exceed 300 feet.
(6) Residential building setback lines. Within the town the residential building setback lines for Hillside Subdivisions shall conform to the requirements of the zoning ordinance.
(1979 Code, § S-5-4) (Ord. passed 6- -1987)