§ 1201. Streets.

(a)

Continuation of adjoining street system. The proposed street layout must be coordinated with the street system of the surrounding area. Where possible, existing major streets shall be extended.

(b)

Access to adjacent properties. Where it is desirable to provide for street access to adjoining property, proposed streets must be extended by dedication to the boundary of such property and a temporary turnaround must be provided.

(c)

Private streets. Private streets are those which have not been dedicated either to the state or to the governing authority of the city. All such nondedicated streets must be clearly indicated during the time of application for subdivision approval and must be noted on each deed of all lots which abut the street requirements of this ordinance. Maintenance arrangements for such streets must be stated in writing on subdivision plat submittals. All private streets must meet the same design and construction standards required by this ordinance.

(d)

Street names. A proposed street, which is obviously in alignment with or an extension of an existing and named street will bear the assigned name of the existing street. Except for the above, in no case will the name of a proposed street duplicate or be phonetically similar to an existing street name, irrespective of the use of suffix, street, avenue, boulevard, drive, place, court, lane, etc. It is unlawful for any person in laying out any new street or road to name such street or road on any plat, by marking, or in any deed or instrument, without first obtaining the approval of the planning commission.

(e)

[Residential street use discouraged.] Residential streets must be so laid out that their use by through traffic will be discouraged.

(f)

Residential buffers for major streets. Where a subdivision abuts or contains an existing or proposed major street, the planning commission may require that lots which abut or are adjacent to the major street face a residential interior access street. Other treatment may also be required, as necessary, for adequate protection of residential properties and for separation of through and local traffic. Special treatment may be required, such as screen planting contained in a nonaccess reservation along the rear property line adjacent to the major street, and deep lots with rear service drives.

(g)

Reserved strips prohibited. Reserved strips at the terminus of a new street or in areas bordering a subdivision are prohibited.

(h)

Street jogs. Street jogs with centerline offsets of less than 150 feet are prohibited.

(i)

Right angle intersections. Street intersection shall be as nearly at right angles as practicable, with the minimum allowable angle of intersection being 80 degrees.

(j)

Cul-de-sac. Such a residential street having one means of egress through a collector or arterial street must not exceed 1,200 feet in length, except for unusual conditions approved by the planning commission and must provide a turn around having a street diameter of at least 80 feet paved. Such length shall be measured from the center of the cul-de-sac turn around to the nearest right-of-way boundary of the adjoining street right-of-way intersection that is not itself a dead-end street (cul-de-sac). Temporary dead-end streets must be provided with a turnaround having a 60-foot diameter (see appendix C-5 [to this ordinance]).

(k)

Pavement and right-of-way widths. Minimum street right-of-way widths and pavement widths per the following table. All streets must have concrete rolled curb and gutter.

Street Classification	Right-of-Way (feet)	Pavement Width (feet)	Width including Curb and Gutter (feet)	Appendix
Residential	50	22	26	C-1
Collector	60	32	36	C-2
Arterial	100	48	56	C-3
Single lane	30	15	19
Cul-de-sac	120 diameter	80 diameter	84 diameter	C-5

 

(l)

Street shoulders.

(1)

Pavement widths shown do not provide for on-street parking. Service lanes are intended only for loading and unloading of passengers and goods and for disabled vehicles and not for the storage of vehicles.

(2)

Right-of-way widths greater than "minimum" are encouraged because they make for a safer facility and permit future roadway widening without disrupting abutting property.

(m)

Street surfacing. Street paving for all new subdivisions of land falling under the provisions of this ordinance is required. All streets shall be paved with asphaltic concrete mix that conforms to the state highway department specifications. All earth compaction, placement of curbs, drainage, base and paving shall be under the supervision of a licensed engineer. The engineer is required to certify the completed work.

(1)

Compaction. In fill areas, all earth shall be compacted to the levels indicated in a geotechnical report by registered professionals. The top two feet of fill shall be compacted to 95 percent Standard Proctor Test or as specified in the geotechnical report.

(2)

Residential and single lane streets. Following completion and approval of street grading, 900 pounds of stone per square yard (approximately eight compacted inches) shall be applied to each street. See standard detail C-1 [to this ordinance].

(3)

Collector and arterial streets. Following completion and approval of street grading, 1,125 pounds of approved stone per square yard (approximately ten compacted inches) shall be applied to each street. See standard detail C-2, C-3 [to this ordinance].

(4)

Paving. Paving shall be plat mixed hot asphaltic concrete equal to SCDOT standards for binder course and wearing course grades. All streets shall have 2.5 inches of binder course (type HB) and 1.5 inches of wearing surface course (type I-1) applied. See standard detail C-4 standard street notes. All paving must be spread, rolled and tested in accordance with SCDOT standards and specifications.

(n)

Horizontal curves design. A curve shall be introduced at any change in direction of a residential, collector or arterial street. On all streets the maximum allowable degree of curvature shall be determined by the design speed selected by the state department of highways and public transportation and submitted to the for review and approval. All design shall be in accordance with the elements of design established by a Policy on Geometric Design of Highways and Streets by the American Association of State Highway and Transportation officials, latest edition. On residential streets, the degree of curvature shall not exceed the maximum allowed for a design speed of 25 mph without superelevation. On collector and arterial streets, the degree of curvature shall not exceed the maximum allowed for a design speed of 35 mph without superelevation. Design shall be based on appendix D-1 of this ordinance and design procedures as described in a policy on Geometric Design of Highways and Streets by the American Association of State Highway and Transportation Officials (AASHTO).

(o)

Vertical curve design. All changes in vertical grade of a residential collector or arterial street shall be connected by vertical (crest/sag) curves. The minimum length of any vertical curve shall be determined by the [following] formula: (L = KA). Design should be based on the charts, formulas and graphs in the AASHTO "Green Book." At intersections, crest breaks exceeding a total of five percent and sag breaks exceeding three percent (algebraic difference) shall be rounded using a vertical curve design parameters in accordance with AASHTO "Green Book."

(p)

Street grades. Grades on major thoroughfares shall not exceed five percent and will be established by the city or county engineer based on state highway department standards. Grades on collector streets and arterial shall not exceed eight percent unless topographical conditions make this impractical, as determined by the planning commission upon a recommendation from the city engineer. Grades on residential streets shall not exceed ten percent, unless topographical conditions make this impractical. All streets shall have a minimum grade no less than p of one percent as defined by AASHTO "Green Book." Minimum street grades at intersections shall be not more than five percent for at least 50 feet before the intersection.

(q)

Access to major street. Street intersection design shall allow adequate sight distance where geometrically practical, to provide safe vehicular movements in accordance with AASHTO "Green Book."

(r)

Half streets. Half streets are prohibited. Whenever a street is planned adjacent to the proposed subdivision tract boundary, the entire street right-of-way shall be platted.

(s)

Intersections. The centerline of no more than two streets shall intersect at any one point. Streets shall be laid out so as to intersect as nearly as possible at right angles and no street shall intersect any other street at an angle of less than 80 degrees. The angle of intersection is to be measured at the intersection of street centerlines. Curved streets shall have a minimum tangent of 100 feet at intersection. The land immediately surrounding all intersections shall be kept clear of all vegetation and other obstructions which may restrict motorists' view of other vehicles approaching the intersection. Street intersections located closer than 150 feet to another intersection should be avoided.

(t)

Street ditches and channels. All street ditches and channels shall be designed to contain, at a minimum, the peak flow from a 25 year frequency storm. All street ditches and channels shall be designed so that the velocity of flow expected from a 25-year frequency storm shall not exceed to permissible velocities for the type of lining used. All ditches and channels shall be designed and protected against erosion by a professional engineer or landscape architect. Calculations shall be submitted to the city engineer that show how each channel was designed. All plans shall have types of temporary controls clearly marked including but not limited to staple patterns. Reference the South Carolina Stormwater Management and Sediment Control Handbook for Land Disturbance Activities for more information into the design criteria of open channels.