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8o75 7 PAGE 78 -9- IV - 0 - 1 - b. The proposed street 'ayeut shell be coordinated with the existing street system of the surrounding area. Where possible, proposed streets shell be the extension of existing streets. IV - B - 1 - c. Streets shall meet the Minimum construction standards as adopted by the Highway Commisslon for acceptance of streets as additions to the State Highway System but shall be no less than the following: IV - 0 - 1 - e - (1) Widths - Right-of-ray widths, measured from lot line to lot line, shell be as wide as existing streets extend- ed but in no case shall said widths be less than the following: Street Type Re uired Ri ht-of-Wa Width in feet Arterial Streets 90 Collector Streets 70 Minor Streets 60 Marginal Access Streets 60 Cul-de-sacs 60 IV - 0 - 1 c - (2) Partial Widths - A partial width right-of-way, not less thanr0 -feet width, may be dedicated when adjoin- ing undeveloped property; provided that the width of a . partial dedication be such as to permit the installation of such public facilities as may be necessary to serve the lots abutting thereon. When said adjor-ting undevel- oped property is subdivided, the remainder of the full required right-of-way width shall be dedicated. IV - 0 - 1 - c - (3) Grades - Proposed streets shall be adjusted to the contours of the land so as to produce streets having gradients which provide for safety. proper drainage and usable lots. Unless exception is granted as provided in In Section V11 herein, street grades shall not exceed eight (8) per cent. Grades for all streets shall not be less than 0.5 per cent. Grades approaching street inter- sections shall not exceed five (5) per cent for a distance of not less than one hundred (100) feet from the center- line of said intersection. IV - 0 - 1 e - (L) Intersections - Streets shall be laid out so as to intersect as nearly as possible at right angles and no street shall Intersect any other street at an angle less than sixty (60) degrees. Property line radii at street intersections shall not be less than twenty (20) feet and where the angle Is less than seventy-five (75) degrees, a greater radius may be required. IV - 0 - 1 - e - (5) Offsets - Unless exception is granted as provided in Section VII herein, an offset in the alignment of a street across an intersection she 11 not be permitted.