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Land Development Standards necessary to provide for future connections to adjoin- ing unsubdivided tracts where recommended by the Plan Commission and approved by the City Council. A minimum of a twenty-five (25) foot landscaped buffer, established as common ground, shall be pro- vided between the street right-of-way and the side or rear property lines of the lots, tracts, or parcels, associ- ated with the established residential subdivision. Intersection roundings shall be exempt from this requirement. 11. Additional traffic lanes or other widening, pavement thickness, drainage facilities, granular base, traffic control devices, and other improvements may be required to accommodate increased traffic volumes projected to be generated by the development, unsuit- able soil conditions, steep grades, or other conditions. 29-51.2 Street Design Standards All streets shall comply with the applicable standards contained in the Design Criteria for the Preparation of Improvement Plans, established and updated from time to time by the St. Louis County Department of Highways and Traffic, except that the standards established herein shall be the minimum requirement. The City may require addi- tional right-of-way and/or improvements as may be re- quired to accommodate the proposed development and its impact on adjacent streets. The Zoning Administrator, with the advice of the Director of Public Works, may require that the applicant for subdivision plat approval provide a traffic study to assist in determining what additional improvements and/or right-of-way may be necessary. Where a development is accessed from a street or highway under the jurisdiction of the State or County, any required improvements thereon and intersecting streets or drives shall be designed and constructed in accordance with the requirements of the respective agency. 1. Minor (Residential) Street Dimensional Specifications: a. M~inimum Right-oJCway: 50 ft. b. k, rinimum Pavement Width: 30 ft. (Measured back to back of curbs) c. 3/[inimum Cul-de-sac Turnaround.' (1) Right-of-way radius: 54 ft. (2) Pavement radius (to back of curb): 42 ft. d. 3~,rinimum Intersection Radii: (1) Right-of-way: 20 ft. (2) Pavement (as measured to back of curb): 32 ft. The Director of Public Works may permit com- parable cut-offs or chords in lieu of rounded comers. e. Street Pavement.' Concrete or asphalt only. Curb & Gutter: Concrete, vertical or Lip (Rolled), with wheelchair accessible curb ramps provided at sidewalk intersections, designed in accordance with the standards of the Department of Public Works or other authority having jurisdiction. g. Grades of Streets: (1) Maximum Slope: 8.0% (2) Minimum Slope: 2.0% Tree Lawns: The minimum width between the back of curb to the closest edge of sidewalk shall be five (5) feet. Non-Residential and Collector Street Dimensional Specifications: a. Minimum Right-of-way: 60 ft. b. 3d'inimum Pavement Width: (Measured back to back of curbs) - c. 3/Iinimum ~ul-de-sac Turnaround.' 38fl. (1) Right-of-way radius: '67 ft. (2) Pavement radius (to back of curb): 55 fl. Exception: The Plan Commission may recom- mend, and the City Council may approve, a chapt29.£m 5-2 As approved by the Plan Commission on October 22, 1997