(a) Grades. The grades of streets shall be a minimum of five-tenths of one percent on all streets and shall not exceed the following:
(1) Thoroughfares: six percent.
(2) Minor thoroughfares: seven percent.
(3) Local streets and all others: ten percent.
(b) Alignment. All changes in street grades shall be connected with vertical curves of a minimum length equal to twenty times the algebraic difference in the rate of grade for all streets.
(c) Horizontal Curves (Measured on the Centerline).
(1) Thoroughfare streets: minimum of fifteen-degree curve and 385-foot radius.
(2) Minor streets: ninety-degree curve and 100-foot radius.
(3) All other streets: fifty-eight degree curve and 100-foot radius.
(4) A minimum fifty-foot tangent shall be introduced between reverse curves.
(d) Sight Distances (Measured on the Centerline).
(1) Thoroughfare streets: 500 feet.
(2) All other streets: 100 feet.
(e) Intersections.
(1) The minimum radius at the property line shall be fifteen feet, or a ten-foot chord may be substituted in a business district.
(2) The radius at the curb shall be twenty-five feet.
(3) The minimum radius shall be increased when the smallest angle of intersection is less than sixty degrees.
(Ord. 1139. Passed 6-21-60.)