Subdivision Regulations
COVER | SLOPE RANGE (PERCENT) | PERMISSIBLE VELOCITY* EROSION RESISTANT SOILS (FT. PER SEC.) | EASILY ERODED SOILS (FT. PER SEC.) |
Kentucky Bluegrass | 0-5 | 7 | 5 |
Tall Fescue | 5-10 | 6 | 4 |
Smooth Brome | Over 10 | 5 | 3 |
Grass Mixtures | 0-5 | 5 | 4 |
Reed Canary | 5-10 | 6 | 3 |
Redtop* | |||
Red Fescue | 0-5 | 3.5 | 2.5 |
SUBSOIL TEXTURE | MAXIMUM VELOCITY (FT. PER SEC.) |
Sand and sandy loam (non colloidal) | 2.5 |
Silt Loam (also Highlime Clay) | 3.0 |
Sandy clay loam | 3.5 |
Clay loam | 4.0 |
Stiff clay, fine gravel and graded loam to gravels | 5.0 |
Graded silt to cobbies (colloidal) | 5.5 |
Shale, hardpan, coarse gravel | 6.0 |
CLASSIFICATION | MIN. PAV’T (FEET) | MIN. R/W (FEET) | MIN. CENTER- LINE RADIUS (FEET) | MAX. GRADE (PERCENT) | MIN. GRADE (PERCENT) |
Major Arterial | 52 | 100 | 1350 | 4 | 0.5 |
Minor Arterial | 36 | 80 | 850 | 6 | 0.5 |
Collector | 36 | 60 | 510 | 8 | 0.5 |
Other* | |||||
(with curb) | 24 | 50 | 275 | 8 | 0.5 |
(w/o curb) | 22 | 60 | 275 | 8 | 0.5 |
DESIGN ELEMENT | STANDARD |
Maximum Approach Speed | 25 mph |
Clear Sight Distance (length along each approach leg) | 100 feet |
Profile Grade Approach to Intersection | 3% (max) |
Minimum Angle of Intersection Streets shall remain in the angle of intersection for at least 100 feet beyond point of intersection | 75 degrees (90 degrees preferred) |
Minimum Curb Return Radius | |
(a) Curbed (face of curb) | 25 feet |
(b) Uncurbed (edge of pavement) | 30 feet |
Minimum centerline offset of adjacent intersections | |
(a) Local-local | 160 feet |
(b) Local-collector | 200 feet |
(c) Local-arterial | 300 feet |
(d) Collector-collector | 300 feet |
(e) Collector-arterial | 1320 feet |
Maximum degree of curvature | 20 degrees |
DIRECTION | OVER 1000 FEET LONG | LESS THAN 1000 FEET LONG |
North/South | Street | Place |
East/West | Avenue | Court |
Diagonal | Road | Way |
Curving | Drive | Circle |
Street Type | Aggregate Base | Deep Strength | Concrete Base | Concrete | |||||||
304 | 301 | 402 | 404 | 301 | 402 | 404 | 305 | 402 | 404 | 452 | |
Local or Collector Street | 4" | 4" | 1.5" | 1.5" | 6" | 1.5" | 1.5" | 6" | 1.5" | 1.5" | 6" |
Minor Arterial Street | 5" | 5" | 1.5" | 1.5" | 7" | 1.5" | 1.5" | 7" | 1.5" | 1.5" | 8" |
Major Arterial or Industrial Street | 5" | 7" | 1.5" | 1.5" | 9" | 1.5" | 1.5" | 8" | 1.5" | 1.5" | 9" |
Subdivision Regulations
COVER | SLOPE RANGE (PERCENT) | PERMISSIBLE VELOCITY* EROSION RESISTANT SOILS (FT. PER SEC.) | EASILY ERODED SOILS (FT. PER SEC.) |
Kentucky Bluegrass | 0-5 | 7 | 5 |
Tall Fescue | 5-10 | 6 | 4 |
Smooth Brome | Over 10 | 5 | 3 |
Grass Mixtures | 0-5 | 5 | 4 |
Reed Canary | 5-10 | 6 | 3 |
Redtop* | |||
Red Fescue | 0-5 | 3.5 | 2.5 |
SUBSOIL TEXTURE | MAXIMUM VELOCITY (FT. PER SEC.) |
Sand and sandy loam (non colloidal) | 2.5 |
Silt Loam (also Highlime Clay) | 3.0 |
Sandy clay loam | 3.5 |
Clay loam | 4.0 |
Stiff clay, fine gravel and graded loam to gravels | 5.0 |
Graded silt to cobbies (colloidal) | 5.5 |
Shale, hardpan, coarse gravel | 6.0 |
CLASSIFICATION | MIN. PAV’T (FEET) | MIN. R/W (FEET) | MIN. CENTER- LINE RADIUS (FEET) | MAX. GRADE (PERCENT) | MIN. GRADE (PERCENT) |
Major Arterial | 52 | 100 | 1350 | 4 | 0.5 |
Minor Arterial | 36 | 80 | 850 | 6 | 0.5 |
Collector | 36 | 60 | 510 | 8 | 0.5 |
Other* | |||||
(with curb) | 24 | 50 | 275 | 8 | 0.5 |
(w/o curb) | 22 | 60 | 275 | 8 | 0.5 |
DESIGN ELEMENT | STANDARD |
Maximum Approach Speed | 25 mph |
Clear Sight Distance (length along each approach leg) | 100 feet |
Profile Grade Approach to Intersection | 3% (max) |
Minimum Angle of Intersection Streets shall remain in the angle of intersection for at least 100 feet beyond point of intersection | 75 degrees (90 degrees preferred) |
Minimum Curb Return Radius | |
(a) Curbed (face of curb) | 25 feet |
(b) Uncurbed (edge of pavement) | 30 feet |
Minimum centerline offset of adjacent intersections | |
(a) Local-local | 160 feet |
(b) Local-collector | 200 feet |
(c) Local-arterial | 300 feet |
(d) Collector-collector | 300 feet |
(e) Collector-arterial | 1320 feet |
Maximum degree of curvature | 20 degrees |
DIRECTION | OVER 1000 FEET LONG | LESS THAN 1000 FEET LONG |
North/South | Street | Place |
East/West | Avenue | Court |
Diagonal | Road | Way |
Curving | Drive | Circle |
Street Type | Aggregate Base | Deep Strength | Concrete Base | Concrete | |||||||
304 | 301 | 402 | 404 | 301 | 402 | 404 | 305 | 402 | 404 | 452 | |
Local or Collector Street | 4" | 4" | 1.5" | 1.5" | 6" | 1.5" | 1.5" | 6" | 1.5" | 1.5" | 6" |
Minor Arterial Street | 5" | 5" | 1.5" | 1.5" | 7" | 1.5" | 1.5" | 7" | 1.5" | 1.5" | 8" |
Major Arterial or Industrial Street | 5" | 7" | 1.5" | 1.5" | 9" | 1.5" | 1.5" | 8" | 1.5" | 1.5" | 9" |