HomeMy WebLinkAboutSTA200800001 Legacy Document 2008-09-30Comparison 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 allowed
*** drainage requirements from Water Protection Ord. section 17-320 for stream crossings; bridge, arch or box, with mitigation
**** a 16% grade is typically used as a maximum in design
highlighted areas are where the driveway standards are actually greater than the road standards
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
minimum
shoulder
width (ft)
maximum
grade
vertical
alignment
Kc, Ks
maximum
horizontal
curvature (ft)
sight distance
minimum (ft)
turnaround
required
drainage
minimum
clearance vert.,
horz. (ft)
driveway
Yes
n/a
n/a
10
n/a
16%
n/a
n/a
n/a
n/a
10 r + *""
14, 10
2lots
No
30
n/a
n/a
n/a
n/a
n/a
n/a
n/a
No
n/a
n/a
3-5 lots
Yes
30
>7% paved,
<7% gravel
14
3
n/a****
5, 15
40
100
Yes
yr
n/a
6 or more lots
Yes
40
paved
18
4116%
or 10%**
10,20
95 or 120**
125
Yes
_10
10 r
variable, 26'+
* paved refers to prime and seal, not asphalt.
** the second value refers to VDOT rolling terrain, the first to mountainous terrain, which is usually allowed
*** drainage requirements from Water Protection Ord. section 17-320 for stream crossings; bridge, arch or box, with mitigation
**** a 16% grade is typically used as a maximum in design
highlighted areas are where the driveway standards are actually greater than the road standards
Road standards from Sub. Ord. section 410 and 412
Driveway standard from Zoning Ord. section 4.6.6