A. General. The width of a city street shall include the pavement (traveled portion) of the street plus the width of the curb and gutter on each side e.g. a local street having a pavement width of 26 feet plus the width of each curb and gutter as approved by the Board of Public Works and Safety (B.O.W.) using the type selection from one of those illustrated in Figure 8-8, Residential Detail No. 1, 18-inch Concrete Curb/Concrete Sidewalk; Figure 8-9, Residential Sidewalk Detail No. 2, Rolled Curb and Gutter/6-inch x 6-inch Concrete Curb and Gutter; Figure 8-10 Commercial Detail Curbface and Wingwalk. The Columbia City Board of Public Works and Safety shall also determine the need and/or placement of improvements shown in Figure 8-11 Paraplegic and Bicycle Ramp Detail Example; Figure 8-12, General Sidewalk Detail Example; Figure 8-13, Passenger Loading Zones Instructions; Figure 8-14, Passenger Loading Zone Illustrations.
The rural road shall be measured in like manner using the width of the pavement (traveled portion) of the road plus the width of the berm on each side. The total measurement would be from the back of the berm on one side to the back of the berm on the opposite side.
The subgrade for the curbs and gutters shall be an extension of the compacted base or grade of the pavement (traveled portion) of the street/road.
The street grade shall be as follows: arterial–4%; collector–6%; local–8%; alley–10 %; cul-de-sac–6% (These percentages are from the existing ordinance. In no case shall the street surface exceed a street grade of three and one-half inches.)
B. Sidewalks and greenspaces.
1. Spacing between sidewalk and property line - 1.0
2. Sidewalk width: Residential - 4.0; Commercial - 5.0.
3. Sidewalk thickness: 4 with wire mesh reinforcement. Thickness varies with location.
4. Sidewalk slope to street 1/4 per foot. Final grade of the sidewalk is to exceed the grade of the greenspace.
5. Distance between transverse joints: 5.0.
6. Transverse joint depth: 1/2.
7. Distance between expansion joints: 50.0.
8. Preformed joint filler: 1/2.
9. See Figure 8-12, General Sidewalk Detail.
10. Greenspace (green lawn) on prepared subgrade shall be comprised of 4 top soil.
11. Greenspace (green lawn) between curbing and outer edge of sidewalk shall be variable.
12. Greenspace slope to street: 1/2 per foot.
C. Curb and gutter. Construction and configuration details of curbs and gutters are discussed in § 4.22. Approval of design for them shall be the responsibility of the City Board of Public Works and Safety, the Superintendent of the City Sewer/Street Department, or the city designated consulting firm. See Figures 8-8 through 8-10.
D. Street/Road Specifications City Rural
1. Right-of-way
Arterial 80 ft. 80 ft.
Collector 70 ft. 70 ft.
Local 60 ft. 60 ft.
Alley 20 ft.
Cul-de-sac * 60 ft. (See Figure 8-7)
2. Street/Road Width**
Arterial 48 ft. 56 ft.
Collector 40 ft. 48 ft.
Local 30 ft. 32 ft.
Alley 12 ft.
Cul-de-sac 45 ft. 45 ft.
(Refer to Figure 8-7)
3. Sight Distance on hills (minimum)
Arterials 600 ft.
Collector 400 ft.
Local 200 ft.
Alley 100 ft.
Cul-de-sac* 200 ft.
4. Centerline Radius (minimum)
Arterial 500 ft.
Collector 300 ft.
Local 200 ft.
Alley 100 ft.
Cul-de-sac* 200 ft.
5. Tangent Between Reverse Curves
Arterial 300 ft.
Collector 200 ft.
Local 25 ft.
Alley 50 ft.
Cul-de-sac* 25 ft.
6. Angle At Intersection 90 degrees
7. Speed (Design Only)
Arterial 50 MPH
Collector 45 MPH
Local 45 MPH
Alley
Cul-de-sac*
8. Bridge Width (Traveled Portion)
Arterial 48 ft. 44 ft.
Collector 40 ft. 24 ft.
Local 30 ft. 24 ft.
Sidewalks shall be considered as part of the bridge width.
9. Radius of Curves
Arterial 500 ft.
Collector 300 ft.
Local 200 ft.
Alley 100 ft.
Cul-de-sac 200 ft.
* See Figure 8-7 Cul-de-sac Turn-around Plus Distance to Intersection with Street Centerline.
**Includes Curb and Gutter (2 ft. each side - City)/Berm (6 ft. each side Rural Arterial and Collector; 3 ft. each side Local.
E. Additional standards and comments for all streets.
1. The street widths for the city streets and for the roads under its jurisdiction have been noted in the Street/Roads Specification tabulation.
2. The slope of the berms shall be one-half inch per foot.
3. The compacted base or grade shall be extended two feet beyond each edge of the proposed pavement (traveled portion) when curb and gutter are to be added. The depth of the stone under the curb and gutter shall be a minimum of two inches.
4. Where curbs and gutters are not required, berms shall be provided of stone, asphalt emulsion, or other material approved by the Columbia City Board of Public Works and Safety.
5. The slope of the paved (traveled) portion of the road shall be one-fourth inch per foot on each side of the crown located at the centerline point of the road.
6. The compacted aggregate base shall extend one foot on each side of the binder and surface areas of the road where curb and gutter are not required.
7. A prime coat may be applied to the surface of the compacted aggregate base.
8. The slope of the side ditches shall be of a 3:1 ratio.
9. The pavement cross-slope shall be between one-half inch per foot and three-eighths inch per foot.
10. The shoulder cross-slope shall be between one-half inch per foot and one inch per foot.
11. For all low volume streets less traveled and not having curbs and gutters, three feet of the shoulders shall consist of four inches #73 stone.
12. The right-of-way shall be adequate for construction and maintenance, shoulders, ditches, curbs, gutters, sidewalks, (when required).
13. Parking shall be restricted to parallel parking on one side of the street at discretion of the Board of Public Works and Safety.
14. When a street connects one collector street with another collector street in a high-density subdivision, it may be considered a collector street rather than a local street and as such, it shall be constructed in accordance with the requirements of a collector street.
16. Pedestrianways/crosswalks/bicycle paths are generally 6 feet in width with a right-of-way of 12 feet, but the width may be variable as determined by usage, e.g. greater width to accommodate greater foot and bicycle traffic or to adjust the width of the sidewalk associated with them.
17. Fire lanes shall be 20 feet or more in width. Refer to Chapter 94, Fire Prevention Code, with particular reference to § 94.040, Fire Lanes Established. Fire lanes shall have curves and corners broad enough to permit passage by any fire-fighting equipment owned by the City. The surface of the fire lane shall be an all-weather surface and shall be of sufficient strength to support all fire-fighting apparatus presently used by the City Fire Department.
Fire lanes shall be added, per Chapter 94, on private property used for assembly, commercial, educational, industrial, institutional, or multi-family dwelling purposes, and on private property containing two or more dwellings to which access is provided by private roads or driveways.
Subdivision plans shall show compliance with the referenced ordinances unless there is no location where a fire lane is required under the terms of the ordinance for fire lanes.
All plans for fire lanes and fire hydrants shall be referred to the City/Township Fire Chief for examination. The Fire Chief shall report to the Planning Commission indicating whether or not the proposal complies with the City's Fire Prevention Code.
Fire hydrants shall be located 500 feet from each other. Locations other than specified, e.g. commercial or industrial complexes, shall be as directed by the Fire Chief.
18. Right turn lanes shall be provided on all collector streets exiting onto a more heavily traveled street such as an arterial street. Where deemed advisable for the safe and efficient movement of traffic, they shall be provided for left turn onto more heavily traveled streets. All turn lanes are subject to state and federal approval when appropriate.
F. Arterial streets/Columbia City. An arterial street interconnects with expressways providing a continuous high priority network which primarily serves regional and inter-city traffic. The following data comprise the minimum, unless otherwise stated.
1. Construction material for arterial streets:
a. Rigid concrete–eight-inch 3,500 or 4,000 psi concrete mix; three-inch #73 stone.
b. Full depth asphalt–11 inches.
c. Base plus flexible asphalt–Two-inch asphaltic top, five-inch hot asphaltic base; six-inch #73 stone; eight-inch #2 stone.
G. Collector streets/Columbia City. A collector street provides for the flow of traffic from neighborhood street systems (minor collectors and local streets) to the arterial street system, generally accommodating a moderate service level and traffic volume. The following data comprise the minimum, unless otherwise stated. For purposes of this ordinance, a collector street shall be considered an industrial or sub-collector street unless otherwise determined by the Columbia City Board of Public Works and Safety or the Superintendent of the City Street Department.
1. Construction material for collector streets:
a. Rigid concrete–seven-inch 3,500 or 4,000 psi concrete mix; three-inch #73 stone.
b. Full depth asphalt–nine inches.
c. Base plus flexible asphalt–one-inch hot asphaltic top; three-inch hot asphaltic base; four-inch #73 stone; six-inch #2 stone.
H. Local streets/Columbia City. A local street is a residential street designed to provide access to adjacent property and to conduct traffic from low volume streets to an activity center or higher classification street. The following data comprise the minimum, unless otherwise stated. For purposes of this ordinance, a local street is a low volume street or a local street which forms a part of a boulevard, unless otherwise determined by the Columbia City Board of Public Works and Safety, or the Superintendent of the City Street Department.
1. Construction material for local streets:
a. Rigid concrete–six-inch 3,500 or 4,000 psi concrete mix; three-inch #73 stone.
b. Full depth asphalt–seven inches.
c. Base plus flexible asphalt–one-inch hot asphaltic top; three-inch hot asphaltic base; two-inch #73 stone; six-inch #2 stone.
I. Alley/Columbia City. An alley or service drive is provided to facilitate access to businesses/houses without interference with normal street traffic. The following data comprise the minimum, unless otherwise stated, design standards for alleys/service driveways. See also § 4.15H.8.
1. Construction materials for alleys/service driveways:
a. Rigid concrete–five and one-half inch 3,500 or 4,000 psi concrete mix; three-inch #73 stone.
b. Full depth asphalt–seven inches.
c. Base plus flexible asphalt–one- inch hot asphaltic top; three-inch hot asphaltic base; two-inch #73 stone; six-inch #2 stone.
J. Cul-de-sac/Columbia City. A cul-de-sac is a street having access to only one street and is provided with a turn-around at the end opposite the entrance to it. A cul-de-sac shall be constructed of the same material as used for the street from which it emerges. See also § 4.15H.5.
1. Construction materials for cul-de-sacs:
a. Rigid concrete–seven-inch 3,500 or 4,000 psi concrete mix; three-inch #73 stone.
b. Full depth asphalt–nine inches.
c. Base plus flexible asphalt–one-inch hot asphaltic top; three inches hot asphaltic base; two inches #73 stone; six inches #2 stone.
K. Private streets. Private streets/roads/drives shall be constructed of the same material and standards as required by the Columbia City Board of Public Works and Safety for local streets.
L. Pedestrianways/crosswalks. Pedestrianways/ crosswalks not associated with a street shall be constructed of the same material as for sidewalks.
M. Bicycle pathway. Bicycle pathways shall be constructed of 3,500 or 4,000 psi concrete mix with four inches concrete on two inches #53 stone base, or two and three-fourths inches asphalt surface on three inches #53 stone and three inches #2 stone base.
N. Driveway approach from street. Driveway approaches from the street to the internal driveway located on the property shall be made of Portland cement concrete having a psi of 3,500 or 4,000 psi. The approach shall have a well compacted base of #73 stone, and a concrete thickness of six inches, reinforced with re-rods or wire mesh.
The concrete thickness of a private drive, as differentiated from the driveway approach, shall be four inches thick.
(1980 Code, Ch. 154, § 4.16) (Ord. 2001-4, passed 3-27-2001)