1107.02 DESIGN STANDARDS.
   (a)    Streets. The street system shall be so designed that all proposed streets shall be in conformity with modern practices of land subdivision and in general conformity with a plan for the most advantageous development of the entire neighborhood. The streets shall be extended to the boundaries of the tract to be recorded unless prevented by topography or other physical conditions or unless, in the opinion of the approving authority, such extension is not necessary or desirable for the coordination of the layout of the subdivision with the development of adjacent tracts. Dead-end streets or cul-de-sacs will be approved only where necessitated by topography or other physical conditions or where, in the opinion of the approving authority, they are appropriate for the type of development contemplated. Streets shall intersect one another as nearly at right angles as practicable.
   (b)    Width of Right of Way of Streets.
 
Feet
Business and industrial
80
Main
70
Collector
60
Minor*
60
   *Where a minor street is being developed adjacent to land not owned by the developer and slope rights cannot be obtained, additional right-of-way width may be required by the Planning Commission.
   Where unusual grading conditions exist, necessitating longer backslopes, additional right-of-way widths or slope rights may be required by the Planning Commission.
   (c)    Dead-End Streets. At the end of every dead-end street a turning circle with a property line diameter of 125 feet and a surfaced roadway diameter of eighty feet shall be provided. When it is proposed to extend the road at a later date, the turning circle shall be in the nature of an easement over the premises included in the turning circle, but beyond the boundaries of the street proper, and shall cease to exist and shall be eliminated when the dead-end street is legally extended by dedication. The Commission may permit the developer to use a “T” turnaround requirement when it deems it unnecessary. Reservations of not less than one foot nor more than five feet shall be provided at all dead-end streets adjacent to a property line and shall be deemed dedicated as a public highway upon the extension by dedication plat.
   (d)    Street Curvature. The minimum radius of curvature for all business, industrial and main streets or thoroughfares shall be 300 feet on the centerline, unless otherwise specified by the Commission.
(Ord. 72-13. Passed 7-11-72.)
   (e)    Street Grades. No street grade shall exceed eight percent. The grade of main or secondary thoroughfares shall not exceed six percent. All changes of grade shall be connected by vertical curves of appropriate lengths unless approved otherwise by the Municipal Engineer. Where a minor street enters a main or secondary thoroughfare, the grade of the minor street shall not exceed four percent for a distance of 150 feet from the intersection centerline. Minimum grades on any street or road shall be one-half percent for purposes of drainage.
(Ord. 73-13. Passed 5-15-73.)
   (f)    Blocks, Crosswalks. Blocks shall not exceed 1,200 feet in length, subject, however, to the right of the Commission to increase the length where, in specific cases, unusual topographic or exceptional conditions require such modification. Where conditions demand, a crosswalk right of way, at least ten feet wide, shall be provided near the center and entirely across the blocks.
   (g)    Lots. The size of all lots in any proposed allotment shall not be less than the minimum area required by the Zoning Code for a dwelling in the district in which such parcel is located. On straight streets, the side lines of lots, so far as practicable, shall be at right angles to the street lines on which they face; on curving streets the side lines shall be radial lines so far as practicable.
   At the intersection of two or more streets, the corners of property lines shall be rounded by a circular arc, the minimum radius of which shall be fifteen feet. This minimum radius shall be increased when the angle of intersection is other than ninety degrees. The minimum lot frontage for a corner lot shall be increased by ten feet.
   (h)    Open Spaces. Due consideration should be given to the allocation of suitable property for schools, parks and playgrounds to be dedicated or to be reserved for the common use of all property owners within the subdivision by covenants in the deeds. It is deemed desirable that at least five percent of the net area of every plat, exclusive of streets, should be set aside as a play park. Where the tract contains less than forty acres, such reservation for open spaces should be combined, wherever possible, with similar reservations on adjoining tracts, and shall be located adjacent to the exterior property line with a view to making possible the addition of land from the neighboring land in the creation of a single larger tract.
(Ord. 72-13. Passed 7-11-72.)