(A) Horizontal curves shall be circular curves with a minimum centerline radius of not less than 100 feet for local streets, and 200 feet for collector streets. Curves on streets with higher classifications shall be designed on an individual basis. A tangent of at least 100 feet shall separate reverse curves.
(B) All vertical curves shall be parabolic type curves. Minimum vertical curve lengths (L) shall depend on the design speed and shall be equal to K times A where K equals the coefficient as shown in the table below, and A equals the algebraic difference in grades when the grades are expressed as a percentage. (Lmin=KxA)
Vertical Curve Coefficient (K) Speed | K Values | |
(mph) | Crest | Sag |
25 | 20 | 30 |
30 | 30 | 40 |
35 | 40-50 | 50 |
(Ord. 2009-11-347, passed 11-3-09; Am. Ord. 2010-06-356, passed 6-1-10; Am. Ord. 2018-11-816, passed 11-6-18; Am. Ord. 2021-04-939, passed 4-6-21)