APPENDIX B: MINIMUM STREET DESIGN STANDARDS

Exhibits:

   1.   Minimum standards for street design with curbs

   2.   Minimum standards for street design without curbs

   3.   Minimum gradient standards for street design

   4.   Design characteristics of street pavements

   5.   Street cross-section standards

   6.   Typical street cross-sections (concrete)

   7.   Typical street cross-sections (asphaltic and concrete)

   8.   Integral curb detail

EXHIBIT 1: MINIMUM STANDARDS FOR STREET DESIGN WITH CURBS *

Street	Right-of-Way Width	Roadway Width	Radius of Horizontal Curves, Figures to the Centerline	Tangents between Reverse Curves
Arterial thoroughfare**	150 feet	**	**	**
Primary and parkways**	80 feet	**	300 feet	100 feet
Secondary**	60 feet	33 feet	200 feet	40 feet
Section and half section line	60 feet	33 feet	200 feet	40 feet
Local	50 feet	27 feet	150 feet (+)	40 feet
Cul-de-sac	50 feet	27 feet	150 feet	40 feet
Cul-de-sac turnaround diameter	100 feet	73 feet
Marginal access	40 feet	25 feet	150 feet	**
Business and industrial districts	80-100 feet	53 feet	500 feet	200 feet
Boulevard**, 1/	**	25 feet	200 feet	40 feet

 

Notes:

*Specifications for roadway construction shall be as specified in this chapter and any other subsequent and applicable county ordinance.

**Minimum standards for these streets shall be as indicated or as determined by the Plan Commission and the County Highway Supervisor.

***Roadway width is as required for curbed streets and indicates distance from each to back of curb.

(+)In instances where a turn of 90 degrees, or near 90 degrees is planned, a lesser radius is acceptable; however, an enlargement of the right-of-way and    pavement is required on the outside edge of the street as indicated in the sketch.

1/In the event boulevard-type streets are constructed, provision shall be made in the deed restrictions for the continuous maintenance of the median strip, grassed-area, by the lot owners in the subdivision. This provision shall be stated in a manner which is acceptable to the Commission and the Board.

(Ord. 466, Appendix: Minimum Street Design Standards, passed 5-11-98)

EXHIBIT 2: MINIMUM STANDARDS FOR STREET DESIGN WITHOUT CURBS

Street	Right-of-Way Width	Roadway Width	Road Shoulder Width*
Arterial**	150 feet	34 feet	8 feet
Primary**	100 feet	30 feet	8 feet
Secondary	80 feet	30 feet	8 feet
Section and half section line	60 feet	30 feet	8 feet
Local	60 feet	24 feet	8 feet
Cut-de-sac	60 feet	24 feet	8 feet
Cul-de-sac turnaround diameter	120 feet	70 feet	8 feet
Marginal access	40 feet	22 feet	8 feet
Business and industrial districts	80-100 feet	50 feet	10 feet
Boulevard **, 1/		22 feet	8 feet

 

Notes:

*   Road shoulder on both sides of the pavement shall be constructed to the width shown, and the slope of the shoulder shall be ½-inch per foot.

**   Minimum standards for these streets shall be as indicated or as determined by the Plan Commission and the County Highway Supervisor.

   Where roadside swales are constructed, the side slopes shall not be of a steeper gradient than two feet of horizontal measurement to one foot of vertical measurement unless the vertical rise is in conformity with Article VII, Section 1C.

1/   In the event boulevard-type streets are constucted, provision shall be made in the deed restrictions for the continuous maintenance of the median strip, grassed area, by the lot owners in the subdivision. This provision shall be stated in a manner which is acceptable to the Commission and the Board. Radius of horizontal curves and tangent lengths between reversed curves shall be identical to the requirements specified in Exhibit 1.

(Ord. 466, Appendix: Minimum Street Design Standards, passed 5-11-98)

EXHIBIT 3: MINIMUM GRADIENT STANDARDS FOR STREET DESIGN

Street	Maximum Gradient	Minimum Gradient	Clear Sight Distance
Arterial thoroughfare*	5%	0.25%	500 feet
Primary and parkways*	5%	0.25%	300 feet
Secondary	5%	0.25%	200 feet
Section and half section line	5%	0.25%	200 feet
Local	6%	0.25%	150 feet
Cul-de-sac	6%	0.25%	150 feet
Marginal access	6%	0.25%	200 feet
In Business districts	2%	0.25%	500 feet

 

Note:*   Minimum standards for these streets shall be as indicated or as determined by the Plan Commission and the County Highway Supervisor.

(Ord. 466, Appendix: Minimum Street Design Standards, passed 5-11-98)