1236.08  STREETS.
   (a)   General Criteria.
      (1)   All streets, regardless of whether they are private or public, shall be constructed in accordance with the Engineering Construction Standards.
      (2)   The arrangements of streets not shown on a General Development Plan or an Official Map shall be such as to provide for the appropriate extension of existing streets.  The street pattern shall provide ease of circulation within the subdivision and, insofar as practical, should provide access to schools, playgrounds, transportation and other community facilities.
      (3)   Streets serving business and industrial areas shall be planned to connect with arterial streets and to prevent or minimize commercial traffic on residential streets.
      (4)   New street openings shall generally be prohibited within 600 feet of any major intersection or crossing or grade separation structure, as measured along the centerline from such intersection or structure.
      (5)   Minor streets shall be designed as to discourage through traffic.
      (6)   Subdivisions abutting highways shall provide a marginal access street or reverse frontage with a buffer strip for planting, or some other means of separation of through and local traffic as the Planning Commission may determine appropriate.
      (7)   Streets shall be extended to the boundaries of a proposed subdivision unless prevented by topography or other physical conditions or unless the Planning Commission and Council deem extension unnecessary or undesirable within the planned future street pattern of the area in which the subdivision is located and with regard to future access and development of abutting properties.
      (8)   Half streets.  Half streets (half of the width of a full right-of-way) shall not be permitted.  Where a half street exists adjacent to a subdivision, the remaining half street shall be platted or the half street shall be vacated.
   (b)   Geometric Standards.
      (1)   Minimum width of right-of-way and pavement.
         A.   The right-of-way width, measured from lot line to lot line, and the pavement width, measured from edge of pavement to edge of pavement without curbs, shall not be less than the following, except as provided in division (b) of this section:
Street Classification
Minimum Public Right-of-Way Width
Minimum 2-Lane Pavement Width Without Curbs and Without On-Street Parking
Arterial Street
80 feet
28 feet
Collector Street
60 feet
24 feet
Minor Street
60 feet
24 feet
Minor Street cul-de-sac serving 20 homes or less
50 feet
22 feet
         B.   The Planning Commission may recommend exceptions to the minimum width requirements stated in division (a) of this section or may recommend requirements for greater widths.  Recommendations shall be based on traffic studies or other reports justifying the exceptions or additional widths and with the advice of the City Engineer.  Recommendations shall be subject to approval by City Council.
         C.   Where streets are proposed to be constructed with curbs or with on-street parking permitted, the Planning Commission shall recommend that the required street width be increased as recommended by the City Engineer and subject to approval by City Council.
      (2)   Grades.
         A.   Street grades shall be designed to contribute to efficient drainage patterns for lots in the subdivision.
         B.   Grades of arterial streets shall not exceed 6%.  Grades of collector streets shall not exceed 8%.  Grades on other streets shall not exceed 8%.
         C.   No street shall have a grade of less than 0.5 percent.
      (3)   Curvature of roads (horizontal and vertical).
         A.   A tangent at least 100 feet long shall be introduced between reverse curves on arterial and collector streets.
         B.   When connecting street lines deflect from each other at any one point by more than ten degrees and no more than 45 degrees, they shall be connected by a curve with a radius of not less than 100 feet for minor streets and 300 feet for arterial and collector streets.
         C.   Simple parabolic vertical curves shall be used to effect a gradual change between tangent grades where the algebraic difference of grades in percent is greater than 0.5 percent.
         D.   Minimum horizontal radii of centerline curvature.
            1.   Arterial Street            1,000 feet
            2.   Collector Street         300 feet
            3.   Minor Street            200 feet
            4.   Cul-de-sac Street         200 feet
      (4)   Intersections.
         A.   Street intersections shall be as nearly at right angles as is possible and in no case shall be less than 70 degrees.
         B.   The block corners at intersections shall be rounded at the curb line with a curve having a radius of not less than 25 feet for residential street intersections and 55 feet for industrial or commercial street intersections.
         C.   Street jogs with centerline offsets of less than 125 feet are prohibited unless deemed unavoidable and approved by the City Engineer.
         D.   Street intersections shall be separated a minimum of 300 feet measured between centerlines.
         E.   No more than four street legs shall be permitted in any intersection.
         F.   Street intersections shall be at 90 degrees where practical, but in no case less than 70 degrees.
         G.   The minimum radius of right-of-way lines and pavement at intersections shall be 25 feet.
         H.   An intersecting minor street shall have a tangent distance of at least 100 feet or a curve with a minimum 1,400 foot radius.
         I.   An intersecting collector street shall have a tangent distance of at least 200 feet or a curve with a minimum 1,900 foot radius.
         J.   A grade of not greater than 3% shall be used for the through street, with a maximum grade of 5%.  Drainage shall be directed away from the intersection.
      (5)   Sight distances and visibility.
         A.   Minimum vertical visibility (measured four and one-half feet eye level to 18-inch tail light) shall be 800 feet on arterial streets, 500 feet on collector streets and 300 feet on minor streets.
         B.   Minimum horizontal visibility shall be 800 feet on arterial streets, 500 feet on collector streets and 300 feet on all other streets as measured on centerlines.
   (c)   Cul-de-Sac Streets.
      (1)   A cul-de-sac street shall not be longer than 600 feet.
      (2)   A cul-de-sac street shall be constructed with a pave turn-around at the end with a radius of not less than 50 feet and tangent, whenever possible, to the right side of the street.
      (3)   If a cul-de-sac street is of a temporary nature, a similar turn-around shall be provided and provisions made for future extension of the street and reversion of the excess right-of-way (temporary easement) to the adjoining properties.
      (4)   The subdivider who extends the temporary cul-de-sac street shall be required to remove the temporary cul-de-sac and restore the disturbed property.
      (5)   Where a dead-end or stub street extends past a street intersection only to the depth of the corner lot, a turnaround shall not be required.
      (6)   The subdivider shall provide a reservation strip, two feet wide, in the name of the City at the end of all temporary cul-de-sacs. The reservation strip shall become a public street only upon extension of the dedicated street.
   (d)   Special Street Designs.  Where the subdivider proposes a special street or intersection design which is not otherwise permitted by these Regulations, such as a boulevard, one-way street system, roundabouts, traffic-calmed street, or other contemporary street design, the subdivider shall submit a report by a qualified traffic engineer which provide evidence of the safety and functionality of the proposed street design consistent with the purpose and intent of these Regulations.  The Planning Commission may recommend the street design subject to approval by Council.
   (e)   Pavement, Curbs, Gutters.
      (1)   All streets shall be constructed in accordance with the Engineering Construction Standards.  Specifications for thicker or stronger streets shall be set by the City Engineer and required by the Planning Commission as a result of special soil or other conditions in the area concerned.
      (2)   Curbs shall be constructed in accordance with the Engineering Construction Standards.
   (f)   Culverts and Bridges.  All bridges to be constructed shall meet with the approval of the City Engineer and any County and State officials, as required.
   (g)   Curb Cuts and Driveway Aprons.  Curb cuts shall only be permitted with the approval of the City Engineer and in accordance with any access plans adopted by the City.
   (h)   Road Names and Signs.
      (1)   No street shall have a name which will duplicate or so nearly duplicate the name of an existing street as to be confused with such existing street.
      (2)   The continuation of an existing street shall have the same name.
      (3)   Any new street name must be approved by the Planning Commission.
   (i)   Traffic Control and Signs.  Street signs, curb signs, school crossing signs and other signs needed to regulate traffic or for warning purposes shall be required as specified by current City specifications of the same or equal quality, size and style as those being erected by the City at the time of the approval of the subdivision.
(Ord. 46-2009.  Passed 5-11-09.)