MINIMUM STANDARDS FOR STREET DESIGN
Classification Street | Minimum Right Of Way Width | Minimum Pavement Width1 | Minimum Radius Of Horizontal Curves | Minimum Length Of Vertical Curves2 | Minimum Tangent Between Horizon Reverse Curves | Maximum Gradient Of Roadway | Minimum Gradient Of Roadway3 |
Collector | 80 feet | 36 feet minimum | 300 feet | 200 feet | 100 feet | 6.00 percent | 1.00 percent7 |
Local and cul-de-sac leg | 66 feet4 | 27 feet | 150 feet | 100 feet | 50 feet | 6.00 percent | 1.00 percent7 |
Cul-de-sac | 120 feet diameter5 | 90 feet diameter6 |
Notes:
1. Pavement widths are measured edge of pavement to edge of pavement.
2. All vertical grade changes in the roadway centerline of more than 1 percent shall require a vertical curve.
3. Minimum slope of drainage ditch bottom shall be 1.0 percent.
4. Where ditch storm drainage is required in local street rights of way, such rights of way shall be 10 feet wider than noted in table above.
5. If open ditches drain the cul-de-sac, the right of way shall be 140 feet in diameter with a 10 foot utility easement along each front lot line. If storm sewers are used for drainage, the right of way may be reduced to 120 feet with a 20 foot utility easement along the front lot line.
6. Center islands are not permitted. The pavement radius at the throat of each cul-de-sac shall be 50 feet.
7. Minimum gradient may be reduced 0.5 percent if curb and gutter are utilized. Additional geometrics including stopping site distance and intersection site distance shall be in accordance with requirements outlined in the latest edition of the IDOT design manual, or in such cases that may be deemed advisable for proper development, minimum standards as determined by the village engineer.
(Ord. 2004-O-14 § 1)