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The Plan Commission shall not approve any plat unless all streets shown thereon shall be of sufficient width and proper grade, and shall be so located as to accommodate the anticipated volume of traffic thereon, afford adequate light and air, facilitate fire protection and provide a coordinated system of streets conforming to the current Thoroughfare Plan of the Town as shown in Table 1, Urban Section Standards.

(1) General Street Design.

a. The design of all streets shall be considered in their relation to existing and planned streets, to reasonable circulation of traffic, to topographical conditions, to runoff of stormwater, and to the proposed uses of the area to be served.

b. Where new streets extend existing adjoining streets, their projections shall be at the same or greater width, but in no case less than the minimum required width.

c. Where adjoining areas are not subdivided, the arrangement of streets in new subdivisions shall make provisions for the proper projection of streets. When a new subdivision adjoins unsubdivided land, the new streets shall be carried to the boundaries of such unsubdivided land.

d. As a minimum, all streets shall be constructed with a ten (10) inch compacted #53 limestone Type P, Class A or B aggregate base, a two (2) inch #9 or #11 hot mix asphalt (HMA) intermediate, and a one-and-one-half (1-1/2) inch paved 11B hot mix asphalt (HMA) surface. Compaction of subgrade is to be ninety-five (95) percent of Standard Proctor. Compaction of limestone base is to be one hundred (100) percent of Standard Proctor. All subterranean construction below street pavements shall be back-filled with limestone (two (2) inch or smaller). Prior to placing the street surfacing, approved subsurface drainage for the street shall be provided. Concrete pavements (rigid pavement) may be used by the subdivider on approval of the Town Engineer and the Plan Commission.

e. All subdivisions shall have at least two (2) street accesses.

(2) Street Width and Grades.

a. Unless necessitated by exceptional topography, subject to the approval of the Plan Commission, the maximum centerline grade of any street or public way shall not exceed the following:

Street

Percent Grade

Arterial Streets

Six (6) percent

Collector streets

Eight (8) percent

Local streets, alleys, and frontage streets

Ten (10) percent

Pedestrian ways

Twelve (12) percent unless steps of acceptable design are provided

The grade of any street shall in no case exceed twelve (12) percent or be less than one-half of one (0.5) percent.

b. Street grades shall be established wherever practicable so as to avoid excessive grading, the indiscriminate removal of ground cover and tree growth, and general leveling of the topography.

c. Minimum right-of-way widths, paving widths, angle of intersection, curb radius, etc., shall be in accordance with Table 1 Urban Section Standards hereafter or as found in the balance of this section.

Table TABLE 1. URBAN SECTION STANDARDS

Street Type

R.O.W. Width to Be Dedicated

Pavement Width*

Arterial Street:

4-Lane Divided

120 feet

Dual: 34 feet (20-foot median)

Not Divided

100 feet

48 feet

Minor Arterial

90 feet

48 feet

Collector Street

70 feet

40 feet

Minor Streets

60 feet

30 feet

Frontage Streets

37 feet

25 feet

*Back of curb or edge of shoulder to back of curb or edge of shoulder.

(3) Street Jogs. Street jogs with centerline off-sets of less than one hundred twenty-five (125) feet shall be avoided.

(4) Street Intersections. Streets shall intersect at right angles and no intersection shall be at an angle of less than sixty (60) degrees. It must be evidenced that safe and efficient traffic flow is encouraged. Spacing of centerlines crossing a common street shall not be less than one hundred twenty-five (125) feet.

(5) Cul-de-Sacs. Maximum length of pavement cul-de-sac streets shall be six hundred sixty (660) feet measured along the centerline from the intersection of origin to end of right-of-way. Each cul-de-sac shall be provided at the closed end with a turn-around having a minimum outside roadway diameter of one hundred (100) feet and a minimum street property line diameter of one hundred thirty (130) feet.

(6) Half Streets. Half streets shall be prohibited except where the Town finds it to be practicable to require the dedication of the other half when the adjoining property is subdivided.

(7) Street Names. Proposed streets obviously in alignment with existing and named streets shall bear the names of such existing streets. In no case shall the name of the proposed street duplicate an existing street name, including phonetical similarities; the naming of streets shall conform to the County system.

(8) Private Streets. Private streets shall be allowed only in planned unit developments subject to the approval of Plan Commission and Town Council. Public improvements, maintenance, or repairs shall not be approved for any private streets.

(9) Frontage Streets. Where proposed in the Comprehensive Plan/Thoroughfare Plan, or required by the Plan Commission, frontage streets shall be required and incorporated in the proposed plat. Frontage roads that are part of parking lots will be allowed only with Plan Commission approval. These roads will conform to the Town’s standard road construction requirements. Curbs may be required by the discretion of the Plan Commission. Frontage roads must have an easement or right-of-way. Maintenance of the frontage road will be the responsibility of the landowner including patching, striping, snow removal, etc. Cost of the traffic and street signs required will be paid by the landowner. The Town will install the signs at the cost of the developer.

(10) Access to Arterial Streets and Highways. Where a proposed plat is adjacent to an arterial street, spacing of less than six hundred (600) feet between access points to such thoroughfares as measured from centerline of street to centerline of street shall be avoided.

(11) Corners. Curb lines at street intersections shall be rounded at a radius of not less than twenty (20) feet. Where curbs are installed at intersections with streets that do not have curbs, the curbs shall be extended and terminated tangent to the edge of pavement of the street without curbs.

(12) Maintenance. Dedicated streets included in approved subdivisions, except designated State, Federal or County roads, shall be maintained by the Town in which said streets are located unless other written arrangements are made prior to final plat approval.

(13) Asphalt Surface Installation. The asphalt surface (topcoat) shall be installed immediately after the intermediate course is laid. Intermediate courses are to be inspected by the Public Works Department prior to installing the topcoat layer. All repairs to the intermediate layers are required to be made by the subdivider prior to surface layer installation.

(14) Dead End Streets. All dead end streets shall have a guardrail type barricade and reflective markings spanning the width of the street and shall be installed at the end of the pavement. All dead end streets shall have a turnaround sufficient to allow large vehicles such as garbage trucks, dump truck snow plows, fire department vehicles, etc., to turn around and avoid having to back down a street. If such dead end streets are to be extended for future development then the turnarounds can be temporary.

(15) Medians. Medians are to be a minimum width of five (5) feet and shall not prevent turns in either direction from any driveway or street. Medians are not to have grass, but may have trees, shrubbery or other plants with the approval of Public Works.

(16) Utility Street Crossing. Any utility crossing under an existing street must be installed by boring or directional drilling methods. Open cut trenching across existing streets will not be allowed unless approved by the Director of Public Works and/or Town Engineer. If the open cut method is approved, the existing street pavement is to be saw cut a minimum of two (2) feet from the edge of trench on each side of the trench and the pavements removed and replaced to the base layer. The trench backfill is to be compacted INDOT #53, #73, or two (2) inch limestone for entire depth of trench.

(17) Deceleration Lanes and Passing Blisters. Deceleration lanes and passing blisters may be required at new streets that are planned to intersect with existing streets. The Director of Public Works and/or Town Engineer will determine the need for such items to be installed. Design drawings for the deceleration lanes and passing blisters are to be included in the plans submitted for primary plat approval. Deceleration lanes and passing blisters are to be a minimum of twelve (12) feet wide. The length of tapers and lanes is to be determined by the Director of Public Works and/or Town Engineer. All deceleration lanes and passing blisters are to have curb and gutter installed along their entire length.

(18) Center Left Turn Only Lane. A center lane for left turns may be required along the frontage of new subdivisions or commercial/industrial developments. The Director of Public Works and/or Town Engineer will determine the need for such a feature to be installed. Design drawings for the left turn lane are to be included in the plans for primary plat approval. The left turn only lane shall be a minimum of twelve (12) feet wide with proper striping and pavement markings.

(19) Commercial/Industrial Streets and Driveways. Streets and driveways that are to have heavier truck traffic than residential streets shall have an aggregate base thickness of twelve (12) inches. Increased thicknesses of the asphalt intermediate and/or surface layers may also be required if deemed necessary by the Director of Public Works and/or Town Engineer.

(20) Roundabouts (Traffic Circles) Design Specifications. At the sole option of the Plan Commission, a new subdivision may incorporate roundabouts (traffic circles) where traffic congestion may be of concern. Any such approval by the Plan Commission shall be made during the approval of the subdivision. Roundabouts shall utilize the following design specifications:

a. The central island diameter (interior radius of the circle) shall have a face of curb of sixty-seven (67) feet and a back of curb of sixty-five (65) feet to allow for a twenty-four (24) inch depressed curb and gutter section.

b. The inscribed circle diameter (face of curb) shall be ninety-four (94) feet.

c. The central island shall have a ten (10) foot wide concrete truck apron immediately adjacent to the depressed curb and gutter. The pavement section for the truck apron shall be minimally eight (8) inches of INDOT Class A concrete over twelve (12) inches of compacted INDOT #53 limestone.

d. Circulating lane width shall be minimally twenty-seven (27) feet.

e. Entry and exit lane widths shall be minimally fifteen (15) feet.

f. Splitter island radius shall be minimally sixty-four and six-tenths (64.6) feet.

g. Entry speed shall be a maximum of twenty (20) miles per hour.

h. Roundabouts shall otherwise conform to the roundabout design specifications detail sheet attached hereto.

i. Signage shall conform to the roundabout design specifications detail sheet attached hereto. Roundabout landscaping plans shall be submitted and approved by the Plan Commission when a roundabout is approved. Landscaping design considerations shall take into account sight distances and plant selections shall be such that minimal maintenance is required.

(Ord. No. 1707, T. 5, § 3, 7-22-20)