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Where horizontal street lines deflect from each other at any point more than <br />ten degrees, said street lines shall be connected by a curve with a radius of <br />not less than 100 feet for minor streets and of such greater radii in the case <br />of other streets as the planning commission may determine. Streets which <br />shall serve as collector and arterial streets shall have a mi~fimhm radius of <br /> <br />Co <br /> <br />f. <br /> <br />ho <br /> <br />jo <br /> <br />310 feet. Such street may be reduced to a minimum of 240 feet providin~ <br />full superelevation is incorporated in the street design. All Mmficipal State <br />Aid (MSA) roads shall meet current MSA standards for horizontal <br />alignment which is dependant upon design speed. <br /> <br />Street grades shall not exceed 7% for minor and collector streets m~d 4% for <br />thoroughfares, and in no case shall they be less than 0.4%. Wherever <br />feasible, grades within 30 feet of street intersections shall not exceed 3% <br />and all private driveways provid:ing access to public riaht-of- 9.50.30 <br />approach to grade level. - <br /> <br />Different connecting street gradients shall be connected with vertical curves. <br />Minimum length, in feet, of said vertical curves shall be 100 feet or 20 times <br />the algebraic difference in the percentage of grade of the two adjacent <br />gradients. <br /> <br />Street jogs in minor and service streets shall have a centerline offset of not <br />less than 150 feet. Street jogs in collector streets shall have a centefiine <br />offset of not less than 300 feet. <br /> <br />Minor streets shall be so aligned that their use by through traffic will be <br />discouraged. <br /> <br />The maximum length of cul-de-sac streets shall be 600 feet, measured along <br />the centerline from the intersection of origin to the end of the right-of-way. <br />Each cul-de-sac shall have a terminus of nearly circular shape, i with a <br />minimum right-of- way diameter of 130 feet and a minimum roadway <br />diameter of 100 feet. <br /> <br />In those instances where a subdivision abuts or contains an existing or <br />planned thoroughfare or a railroad right-of-way, the planning commission <br />may require a service street approximately parallel to and on each side of <br />such right-of-way <br /> <br />Half streets shall be prohibited except where essential to the reasonable <br />development of the subdivision in Conformity with the requirements, of this <br />Chapter. <br /> <br />Private streets shall not-be permitted in accordance with applicable zoning <br />district, a-pprovcd. <br /> <br />9.50 Subdivision Regulations <br /> <br />9-36 March 2003 Draft <br /> <br />-269- <br /> <br /> <br />