1315 ORD PRESCRIBING RULES & REGULATIONS GOVERNING PLATS, PLANS AND SUBDIVISIONS OF LAND

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w 2o In very unusual circumstances a street may dead«Mend for topographical reasons or in order to develop a de- sirable residential plan, in which case the dead-end street shall have a cul-de-sac with a minimum radius of fifty (50) feeto measured at the center line of the street. (4) Service Roads. 4"Jhen a subdivision contains or is bounded on any or all sides by a U. S. or State Highway or a railroad track and the property within the subdivision faces such pro- perty, then parallel streets shall be constructed down.each side of said highway or railroad. These right of ways shall have a common line. Consideration should be given to the distance required for approach grades to future grade separa- tionso (5) Relation of Adjcining Streets and Lando The system of streets designated for the subdivision, except in unusual casest must connect with streets already dedicated in adjacent subdivi- sions, and where adjacent connections are not platted, must in general be the reasonable proj.ection of streets in the nearest subdivided tracts, and :nust be continued to the boundaries of tlhe tract subdivided, so that other subdividers may connect ~ therewith. Re errre strips of land controlliny access to or egress from oOX property or to or from any street or alley . or having the effect of restricting or damaging the adjoining property for subdivision purposes or which will not be taxable or accessible for special improvements shall not be permitted in any subdivisiono (6) Street Grades. The minimum grade for all streets shall be three tenths (0o3) of one (1) per cento The maximum grade for Arterial Streets shal.t be five (5) per cent; for Collector Streets it shall be eight (8) per cent; for Local 'Streets it shall be ten (10) per cent. If the natural topography is such as to require steeper grades, the above maximum grades may be increased by fifty (50) per cent for a maximum continuous distance of two hundred (200) feet, Center line grade changes with an algebraic difference of more than three (3) per cent and less than five (5) per cent shall be connected tivith at least a two hundred (200) foot vertical curve; for every additional per cent of algebraic difference over five (5) per cent there shall be an additional fifty (50) feet of vertical curveo All algebraic difference in grade below three (3) per cent shall have a vertical curve of not less than one hundred (100) feeto dJhere a cross slope is necessary or desirabb from one curb to the opposite curbp such cross slope shall be not more than one-tenth (1/10th) of a foot per ten (10) feet of paved street width. The grade requirements fer alleys shall conform to those of Local 5treets, (7) Street and 0.11ey Crotvnso The crown of all streets shall be based on one eight (1/8) af an inch per foot of paved street tividth~ but in no case less than four (4) inches, nor more than eighth(8) incheso All alleys shall have an inverted crown of one-eightk(1/8) of an inch per foot of alle~, widtho but in no case less than three (3) inches nor more than five (5) inches. (8) Curve Requirements. (Other than intersections) Arterial Streets shall have a Minimum radii at the center line of 1p920 feet; Collector Streets shall have a minimum radii at the center line Qf 955 feet; and Local Streets and Alleys shall have a minimum radii at the center line of 150 feet. (9) Block Lena,th and y'Jidtho In general, intersecting streets, de- termining the block lengths and widths shall be provided at such intervals as to serve cross traffic adequately and to Meet existing streets or customary subdivision practices. UVhere no existing subdivision contivls»the blocks shall not exceed nine hundred (900) feet in length~ nor be less than four hundred (400) feet in length, 'Nhere no existing subdivision controls) the block widtn or depth shall not exceed three hundred and