8-17-1-3: EXHIBIT 3, STREET GRADE AND GEOMETRIC STANDARDS:

Standards	Local Street Hierarchy
	Rural Lane	Cul-De-Sac	Residential Access Street	Residential Subcollector	Residential Collector
Minimum grade(3)	0.5%	0.5%	0.5%	0.5%	0.5%
Maximum grade	10%	10%	8%	8%	7%
Maximum grade within 50 ft. of intersection	4%	4%	4%	4%	2%
Minimum length vertical curve(1)
Crest	30A	20A	20A	30A	80A
Sag	40A	30A	30A	40A	70A
Minimum centerline radius	280 ft.	170 ft.	170 ft.	280 ft.	600 ft.(2)
Minimum tangent length between reverse curves	150 ft.	100 ft.	100 ft.	150 ft.	250 ft.
Minimum edge radii	20 ft.	25 ft.	25 ft.	30 ft.	35 ft.

 

Notes:

   (1)    "A" = algebraic difference in grades (percent).

   (2)    Collector radius based on 40 mph and no super elevation. Radius may be reduced if design speed is reduced and/or super elevation is provided.

   (3)    Minimum grade for streets with curb and gutter edging. Minimum grade for streets with shoulder edging and drainage swales may be a 0.0 percent grade.

(Res. 91-096, 12-10-1991; amd. 2004 Code; Ord. 10-001, 1-12-2010)