§ A125-6. Street, road and pavement design.

A. 

Street arrangement.

(1) 

Street systems shall be designed with due regard to the needs for: convenient traffic access and circulation; traffic control and safety; access for fire fighting, snow removal, and street maintenance equipment; and stormwater drainage and sewage disposal. Streets shall be designed to accommodate the prospective traffic, and so arranged as to separate through traffic from neighborhood traffic insofar as it is practicable.

(2) 

The streets in contiguous subdivisions shall be coordinated so as to compose a convenient system. Where a subdivision adjoins undeveloped land its streets shall be laid out so as to provide suitable future street connections with the adjoining land when the latter shall be subdivided. A street thus temporarily dead-ended shall be constructed to the property line and shall be provided with a temporary "cul-de-sac" of the same dimensions as for permanent dead-end streets if in excess of 200 feet, with a notation on the subdivision plat providing for temporary easements for the turnaround until such time as the street is extended. These same requirements shall apply at the discretion of the Planning Board in those cases where the adjoining land is another section of the same subdivision, and which is not scheduled for development at the same time.

(3) 

Streets shall be logically related to the topography and all streets shall be arranged so as to obtain as many as possible of the building sites at or above the grades of the streets. Grades of streets shall conform as closely as possible to the original topography. A combination of steep grades and sharp curves shall be avoided.

(4) 

The Town Planning Board will consider the use of the appropriate road section. The developer shall discuss this with the Planning Board and obtain its approval at the sketch layout review stage.

(5) 

Where a subdivision abuts on or contains an existing or proposed arterial street or other existing Town, county or state highway the Planning Board may require marginal access streets, reverse frontage with screen planting contained in a nonaccess reservation along the rear property line, deep lots with or without rear service alleys, or such other treatment as may be necessary for adequate protection of residential properties and to afford separation of through and local traffic.

(6) 

Where a subdivision borders or contains an existing or proposed railroad right-of-way or controlled access highway right-of-way, the Planning Board may require a street approximately parallel to and on each side of such right-of-way, at a distance suitable for the appropriate use of the intervening land, for park purposes in residential districts, or for business, commercial or industrial purposes in appropriate districts. Such distances shall also be determined with due regard for the requirements of approach grades and future grade separations.

B. 

Dead-end streets.

(1) 

Where a street does not extend to the boundary of the subdivision and its continuation is not needed for access to adjoining property, it shall be separated from such boundary by a distance sufficient to accommodate a lot meeting the requirements of Chapter 120, Zoning. Reserve strips of land shall not be left between the end of a proposed street and an adjacent piece of property. However, the Planning Board may require the reservation of an easement for pedestrian traffic or utilities.

(2) 

A cul-de-sac of a minimum right-of-way radius of 100 feet shall be provided at the end of any permanent dead-end street. See Standard Cul-de-Sac Detail in Appendixes.

Editor's Note: Said appendixes are included at the end of this chapter.

C. 

Standards for street design. All streets shall be designed and constructed to conform to the requirements set forth in the following table.

	Standards for Street Design
	Standard	Minor Street	Collector Street
	Minimum width of right-of-way	60 feet	70 feet
	Minimum width of pavement	20 feet	24 feet
	Minimum radius of horizontal curves	150 feet	300 feet
	Minimum length of vertical curves	100 feet but in no case less than 20 feet for each 1% difference of grade	200 feet but in no case less than 30 feet for each 1% difference of grade
	Minimum length of tangents between curves	100 feet	200 feet
	Maximum grade	7%	6%
	Minimum grade	0.5%	0.5%
	Minimum sight distance	200 feet	300 feet
	Minimum shoulder width	4 feet	8 feet
	NOTES: See Appendixes for Cross Section Details.
	Radius of horizontal curves shall be measured to the center line of the street.
	Sight distance shall be measured between two points along the center line of the street on a straight line entirely within the street right-of-way and clean of obstructions, one of the points to be at the surface of the street and the other 3 1/2 feet above the surface.
	Collector streets which do not service an area containing at least 150 dwelling units, under ultimate area development, may be considered as minor streets for purposes of design standards. The service area of a collector includes those dwelling units on minor streets which feed into the collector.

Editor's Note: Said appendixes are included at the end of this chapter.

D. 

Street intersections.

(1) 

Intersections of arterial streets shall be held to a minimum and spaced at least 1,000 feet apart, and intersections of collector streets by other streets shall be at least 800 feet apart. Between offset intersections there shall be a distance of at least 150 feet. Within 50 feet of an intersection streets shall be approximately at right angles and in no case shall the angle of intersection be less than 75º without additional channelization. Minimum edge of pavement radii shall depend on the intersecting street types, and shall be as follows:

(a) 

Collector with collector: fifty-foot radius.

(b) 

Minor with collector: fifty-foot radius.

(c) 

Minor with minor: thirty-five-foot radius.

(2) 

Access streets into the subdivision from an arterial street shall have minimum curb radii of 40 feet. All property corners at street intersections shall be rounded with a radius of 20 feet, or have comparable cutoffs or chords, as the Planning Board determines. Within triangular areas formed by the intersecting street lines, for a distance of 75 feet from their intersection, and the diagonals connecting the end points of these lines, visibility for traffic safety shall be provided, by exclusions of plantings or structures and regrading as necessary.

(3) 

Grades within the intersection shall not exceed 1%; they shall not exceed 1 1/2% for a distance of 50 feet from the intersection; from 50 to 100 feet, the grades shall not exceed 3%, and in no case shall they exceed 7%.

(4) 

Triangles, circles or other traffic channeling islands may be required at intersections where present or anticipated traffic conditions indicate their advisability for traffic control or safety.

E. 

Street grading and shoulders. Areas within street rights-of-way shall be graded as necessary to eliminate any slopes steeper than one foot vertical in three feet of horizontal distance. Street shoulders shall not exceed a slope of 10% at right angle to the street center line. Street sections with concrete gutters shall have grassed shoulders a minimum of six feet wide; grass swale sections shall have shoulders with minimum of eight feet width, treated as indicated on the Appendix Typical Road Section.

Editor's Note: Said appendix is included at the end of this chapter.

F. 

Sidewalks. Concrete sidewalks shall be provided in any locations where they are deemed by the Planning Board to be an appropriate and in the interest of public safety or convenience and in accordance with the Typical Road Section. Particular attention shall be given along existing or proposed collector streets within walking distance of present or proposed schools, as well as in built-up residential or commercial areas.

G. 

Trees. The subdivider shall take adequate measures to preserve desirable existing trees in suitable locations within the subdivision. No trees, shrubs, or fences shall be placed in the right-of-way. Occasionally existing trees of unusual value may be preserved within the street right-of-way if approved by the Planning Board.

H. 

Monuments (see § 100-9 of Chapter 100, Subdivision of Land). Permanent survey monuments shall be set in the boundary of rights-of-way at intersecting streets, PC and PT of curves, though the PI of short curves may be used instead, where such is practical, at the discretion of the Engineer. Monuments shall be placed on one side of the street only and at only one corner of intersecting streets. Adjacent monumented points shall be intervisible.

(1) 

Monument locations shall be shown on the subdivision plat; field notes of ties to monuments or a tie sheet shall be submitted to the Town Engineer after installation of monuments.

(2) 

Monuments shall be of stone or concrete and not less than four inches in diameter or square, and not less than 42 inches long or from the top of underlying rock. Concrete monuments shall be reinforced with steel rods, and a plug, brass plate, or pin shall serve as the point of reference. If stone, a drilled hole shall serve as the point of reference and a magnetic rod or other suitable metal shall be placed adjacent to the monument to allow for recovery.

I. 

Street improvements, general (see Appendix Details). In addition to the required improvements specifically referred to elsewhere in these regulations, subdivision plats shall provide for all other customary elements of street construction and utility service which may be appropriate in each locality as determined by the Planning Board upon consultation with the Town Engineer. Such elements may include, but shall not be limited to, street pavement, gutters, stormwater inlets, manholes, curbs, sidewalks, streetlighting standards, water mains, fire hydrants, fire alarm signal devices, and sanitary sewers. Underground utilities within the street right-of-way shall be located as required by the Town and/or the Town Engineer, and underground service connections to the property line of each lot shall be installed before the street is paved. All street improvements and other construction features of the subdivision shall conform to these specifications and shall be subject to approval as to design, specifications, and construction by the Highway Superintendent and/or the Town Engineer.

Editor's Note: Said appendix is included at the end of this chapter.

J. 

Widening of existing street right-of-way. Where a subdivision adjoins an existing street which does not conform to the right-of-way standards given in the table entitled "Standards for Street Design" in these regulations, the subdivider shall dedicate whatever additional right-of-way width is necessary to provide, on the subdivision side of the normal street center line, a width which is equal to at least 1/2 of the minimum standard width for the respective type of street.

Editor's Note: See § A125-6C.

K. 

Typical Road Section. The typical sections provided in this manual shall be used for all roads. (See Appendixes.)

Editor's Note: Said appendixes are included at the end of this chapter.

L. 

Temporary cul-de-sac. In areas where a temporary cul-de-sac is proposed, the applicant shall provide sufficient, details on the plan showing the road section, dimensions of the roadway and materials. The cul-de-sac shall comply with materials shown on the Temporary Cul-de-Sac Detail in the Appendix. Applicant shall provide cost in the letter of credit to cover the cost of the proposed temporary construction.

Editor's Note: Said appendix is included at the end of this chapter.

M. 

Driveways. All driveways accessing Town roads shall be paved with two inches of binder and one inch of top from the edge of pavement to the right-of-way.

N. 

Turnaround. In areas approved by the Highway Department Superintendent, this design shall be used in regard to two- to three-lot parcels with no future development only. The turnaround shall comply with the design standards detailed in the Appendix.

[Added 8-11-2004 by Res. No. 124]

Editor's Note: Said appendix is included at the end of this chapter.