HomeMy WebLinkAboutSTA200800001 Legacy Document 2008-11-03 (2)Comparison of Standards for Rural Area Roads and Driveways
" paved refers to prime and seal, not asphalt.
** the second value refers to VDOT rolling terrain, the first to mountainous terrain, which is usually alloy
drainage requirements from Water Protection Ord. section 17-320 for stream crossings; bridge, arc
**** a 16% grade is typically used as a maximum in design
changes are highlighted
Road standards from Sub. Ord. section 410 and 412
Driveway standard from Zoning Ord. section 4.6.6
County review before
construction
minimum
easement
width (ft)
surface
material*
minimum
surface
width
driveway
Yes
n/a
n/a
10
2-5 lots
Yes
30
>7% paved,
<7% gravel
14
6 or more lots
Yes
40
paved
18
" paved refers to prime and seal, not asphalt.
** the second value refers to VDOT rolling terrain, the first to mountainous terrain, which is usually alloy
drainage requirements from Water Protection Ord. section 17-320 for stream crossings; bridge, arc
**** a 16% grade is typically used as a maximum in design
changes are highlighted
Road standards from Sub. Ord. section 410 and 412
Driveway standard from Zoning Ord. section 4.6.6
PROPOSED
minimum
shoulder
width (ft)
maximum
grade
vertical
alignment
Kc, Ks
maximum
horizontal
curvature (ft)
sight distance
minimum (ft)
turnaround
required
drainage
n/a
16%
n/a
n/a
n/a
n/a
10 r + ***
3
16%
5, 15
40
100
Yes
10 r
4
16% or 10%**
10,20
95 or 120**
125
Yes
10 r
/red
,h or box, with mitigation
minimum
clearance vert.,
horz. (ft)
14,10
14,10
variable, 26'+