(a) Typical Street Standards. The Planning Commission will determine the required minimum dimensional standards of all rights of way, pavements, sidewalks and other public improvements but shall consider the recommendations of the Director of Public Service in doing so. The typical street requirements shall be as follows:
(1) Major street: the right-of-way width shall be as shown on the Master Thoroughfare Plan. As the geometrical design, pavement and right-of-way widths may vary considerably over that of a typical minor street, the Commission shall decide what portion of the major street construction shall be done by the developer. In doing so, the Commission shall take into account the location, extent and character of the proposed development; the degree to which the proposed lots or use is to be serviced or otherwise has access on the major streets; the number of anticipated employees; and the extent of vehicular traffic that may be generated by the improvement or subdivision upon the major street or streets. In case the subdivision lots are not serviced or otherwise do not have access to the major street, then the subdivider will not be required to make the street improvements therein.
(2) Business, industrial, apartments, row house developments: sixty foot right of way; thirty-six foot pavement including curb and gutter; five foot sidewalks at property line.
(3) Typical one-family detached house developments: fifty foot right of way; twenty-six foot pavement, including curb and gutter; five foot sidewalks at property line.
(4) Dead-end streets: fifty foot right of way; twenty-six foot pavement including curb and gutter; five foot sidewalks at property line. The closed end shall be provided with a turnaround having an outside roadway radius of at least fifty feet, and a street property line radius of at least sixty-seven feet. A "T" or "Y" turnaround may be substituted when approved by the Commission.
(5) Marginal access streets abutting a major street: forty foot right of way; twenty foot pavement with curb and gutter on development side; one sidewalk of five feet.
(6) Alleys: twenty-four foot right of way; twenty foot pavement with four foot space for utilities.
(7) Crosswalks: twenty-five foot right of way; at least five foot walk along centerline.
(8) Easements: Utility easements ten feet in width for communication and electric power and street lighting distribution lines and facilities shall be provided on all front lot lines and along certain side or rear lot lines where necessary. Easements may also be required along or across lots where engineering design or special conditions may necessitate the installation of water and sewer lines outside of public rights of way. Easements shall also be provided for watercourses, channels or streams and shall be adequate for the purpose.
(b) Grades. Minimum grades on any street shall be one-half of one percent at gutters for purposes of drainage and not more than six percent for major streets nor ten percent for minor streets wherever feasible; streets shorter than 500 feet, twelve percent.
(c) Street Alignment.
(1) Vertical. The profile grades for major streets shall be connected by vertical curves of a minimum length equivalent to at least twenty times the algebraic difference between the rates of grade expressed in feet per hundred; for secondary and minor streets, at least fifteen times.
(2) Minimum horizontal radii of centerline curvature.
Major streets | 12 degrees | 475 feet |
Secondary streets | 19 degrees | 300 feet |
Minor streets | 28 degrees | 200 feet |
Dead-end streets | 58 degrees | 100 feet |
A tangent at least 100 feet long shall be introduced between reverse curves on major or collector streets and at least fifty feet on minor streets.
(d) Intersections. Property lines at street intersections shall be rounded with a radius of at least thirteen feet and curbs or edges of street pavements shall be rounded by radii of at least twenty-five feet for residential, and fifty feet for industrial or major street intersections.
(Ord. 1991-121. Passed 6-25-91.)