Loading...
ARTICLE 90.400 STREET DESIGN PRINCIPLES
(A) The principles governing the design of streets shall conform to the requirements of these standards, to the standards that may be referenced herein, and to appropriate city ordinances.
(B) General criteria with regard to street classification and other characteristics shall be as stated in other sections of these standards.
(C) All pavement markings placed shall be thermoplastic unless otherwise approved by the city. Acceptable materials may be found on the current ARDOT “qualified products list”.
(D) Parking, parking lots, driveways, stormwater drainage, and erosion control requirements are specified in separate ordinances and are not included in these standards.
(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)
(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)
Loading...