(A) All materials used in the construction of the road surfaces shall conform to the Standard Specifications for Road and Bridge Construction as established by the State Department of Transportation.
(1) The minimum right-of-way width of any street shall be 50 feet.
(2) The minimum roadway width shall be 24 feet with a minimum surface width of 18 feet.
(3) Minimum lot size shall be one acre in size, excluding road easements, for lots using private sewage disposal systems according to Ch. 50. A larger area maybe required if Franklin-Williamson Bi-County Health Department and/or the County Board deems the minimum acreage will cause health problems or nuisance conditions.
(4) Alleys will only be permitted in high-density residential subdivisions. Alleys shall have a minimum surface width of 16 feet and a minimum right-of-way of 40 feet.
(5) Cul-de-sacs shall have a minimum radius of 40 feet with a corresponding right-of-way radius of 50 feet. The maximum length of any cul-de-sac should be 1,320 feet. The minimum road frontage on a cul-de-sac shall be 25 feet.
(6) Intersections of more than two streets at a point shall be prohibited.
(7) Streets should intersect at right angles as far as physically possible. No streets shall intersect at any angle less than 65 degrees.
(8) Between reverse curves, there shall be a minimum tangent of 50 feet.
(9) Horizontal curves shall have a minimum radius of 255 feet.
(10) Vertical curves shall have minimum curve length of 90 feet.
(11) Set back lines shall have a minimum of 25 feet on all road frontages and have a minimum of ten feet on all other lot lines.
(12) Easements of a minimum of ten feet in width shall be provided on each side of all rear lot lines and alongside water, sewer and/or other mains and for electric and telephone lines or for other public utilities.
(13) No street shall be approved which will be subject to frequent flooding.
(14) All cross road culverts shall have a minimum diameter of 15 inches and all entrance culverts shall have a minimum diameter of 12 inches. All pipes shall be designed in accordance with generally accepted engineering practices. The material and installation shall be subject to the approval of the County Engineer and the Township Road Commissioner.
(15) Subgrade preparation shall be in accordance with § 301 of the Standard Specifications for Road and Bridge Construction. A sub-base may be required also if poor soil conditions exist.
(16) Road beds shall consist of a minimum of eight inches of compacted crushed stone base course with a dust free bituminous surface treatment A-3. All methods and materials shall be in accordance with § 403 of the Standard Specifications for Road and Bridge Construction.
(17) Signs shall be placed in accordance with Manual of Uniform Traffic ControlDevices and the subdivider shall bear all expenses. All signs shall have a minimum reflective sheeting of high- intensity prismatic.
(18) All trees and brush shall be removed from within the limits of the right-of-way.
(19) Roadside ditches with a depth of 18 inches or more shall have a V-bottom ditch with 3:1 front and back slopes.
(B) See table below for minimum street requirements for land access.
Minimum Residential Street Requirements for Land Access | |||||||||
Terrain Classification | Level (0%-8%) | Rolling (8%-15%) | Hilly (Over 15%) | ||||||
Post Development ADT | 0-400 | 401- 1,000 | >1,000 | 0-400 | 401- 1,000 | >1,000 | 0-400 | 401- 1,000 | >1,000 |
Minimum Residential Street Requirements for Land Access | |||||||||
Terrain Classification | Level (0%-8%) | Rolling (8%-15%) | Hilly (Over 15%) | ||||||
Post Development ADT | 0-400 | 401- 1,000 | >1,000 | 0-400 | 401- 1,000 | >1,000 | 0-400 | 401- 1,000 | >1,000 |
Alley policy width | See Discussion | See Discussion | See Discussion | ||||||
Base course thickness | 8” Agg. | 8” Agg. | 8” Agg. | 8” Agg. | 8” Agg. | 8” Agg. | 8” Agg. | 8” Agg. | 8” Agg. |
Cul-de-sac R.O.W. radius (feet) | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
Cul-de-sac surface radius (feet) | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 |
*Curb and gutter required | no | no | yes | no | no | yes | no | no | yes |
**Design speed (mph) | 30 | 30 | 30 | 25 | 25 | 25 | 20 | 20 | 20 |
***Maximum cul-de-sac length (feet) | 1,320 | 1,000 | 700 | 1,320 | 1,000 | 700 | 1,320 | 1,000 | 700 |
**Maximum grades (%) | 4 | 4 | 4 | 8 | 8 | 8 | 15 | 12 | 8 |
**Minimum horizontal curve radius (feet) | 300 | 300 | 300 | 180 | 180 | 180 | 100 | 100 | 100 |
Pavement width (feet) | 18 | 22 | 24 | 18 | 22 | 24 | 18 | 22 | 24 |
Right-of-way | 50 | 55 | 60 | 50 | 55 | 60 | 50 | 55 | 60 |
Roadway crown (%) (tangent only) | 1.5-3 | 1.5-3 | 1-2 | 1.5-3 | 1.5-3 | 1-2 | 1.5-3 | 1.5-3 | 1-2 |
Shoulder type | Earth | Agg. | -- | Earth | Agg. | -- | Earth | Agg. | -- |
Shoulder width (feet) | 2 | 3 | -- | 3 | 4 | -- | 3 | 4 | -- |
Sidewalk distance from curb face (feet) | -- | -- | 5 | -- | -- | 5 | -- | -- | 5 |
Sidewalk width (feet) | -- | -- | 5 | -- | -- | 5 | -- | -- | 5 |
**Stopping sight distance (feet) | 200 | 200 | 200 | 155 | 155 | 155 | 125 | 125 | 125 |
Surface type and thickness | A-3 | A-3 | 3” HMA | A-3 | A-3 | 3” HMA | A-3 | A-3 | 3” HMA |
**Tangent between reverse curves | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
NOTES TO TABLE:
* Where no curb and gutter is required; roadside ditches w/min 18” depth, V-bottom and 3:1 front and back slopes shall be provided ** Recommended *** Length of maximum grade sections to be limited 300 feet | |||||||||
(Ord. 2013-04, passed 5-6-2013) Penalty, see § 151.99