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(A) The width and locations of all streets in a proposed subdivision shall conform to the city's comprehensive plan.
(B) All streets classified as arterial streets by the comprehensive plan may be considered as limited access in accordance with KRS 177.220 through 177.310, defined herein as controlled access. All points of access shall be as approved by the Planning Commission.
(C) Relationship to topography. In all classifications of land, streets shall be designed with respect to topography to produce the most usable and properly situated lots, provide proper drainage for storm water, and produce proper grades. On Type II, III, and IV land, streets should be parallel to the contour of hillside, following natural benches or breaks in the hillside.
(D) Street extensions.
(1) Extension of present streets. The street layout of the proposed subdivision shall provide for the continuation or extension of streets already existing in areas adjacent to the area being subdivided unless the Planning Commission deems continuation or extension undesirable for specific reasons of topography or design.
(2) Extension of proposed streets. Where, in the opinion of the Planning Commission, it is desirable to provide street access to adjoining properties, proposed streets shall be extended by dedication to the boundaries of these properties. Where the Planning Commission deems it necessary, dead-end streets constructed on Type I land shall be provided with a temporary turnaround. On Type II, III and IV land, a “T” turnaround shall be permitted where in the opinion of the Planning Commission, a circular turnaround cannot be built due to topography.
(E) Length of streets. The rights-of-way and pavements shall be determined by use of the definition of contained in § 155.05, land use along the street, and the length of the street as set forth herein.
(1) Arterial streets. There shall be no limit placed on the length of arterial streets.
(2) Collector streets.
(a) Standard. Collector streets which serve minor streets and are not dead-end collector streets as indicated in division (b) below shall not be limited in length. Their length is usually only a few miles.
(b) Dead-end. Collector streets which are permanently dead-end, over 1,000 feet in length, and serve only single-family dwellings, will be dead-end collectors. There, maximum length is unlimited. The principal reason for these streets to be dead-end is extreme topography preventing their extension.
(3) Minor streets.
(a) Through. These streets are through streets or serve lots other than residential lots. Their length is unlimited in nonresidential areas, but limited to 1,200 feet between intersections in residential areas.
(b) Local. These streets are cul-de-sacs or loop streets which serve only single-family dwelling units. Local streets intersect collector streets. Local cul-de-sacs are limited to 1,000 feet in length. Loop streets are limited to 2,000 feet in length.
(4) Marginal access streets. There is no limit to the length of marginal access streets. Their length is determined by the street they parallel and serve.
(5) Alleys. There is no limit to the length of alleys. Their length is usually no more than a few blocks.
(F) Right-of-way required.
(1) Right-of-way widths. The dedication of right-of-way for new streets measured from lot line to lot line shall be as shown on the city's comprehensive plan, or if not shown thereon, shall meet the following standards:
Right-of-way Widths (Feet)
Marginal access streets
(a) NP shall mean not permitted.
(b) * shall mean permitted only with permission of the Planning Commission.
(c) ** shall mean permitted only with permission of the Planning Commission. Right-of-way may be lowered where five or fewer single-family dwellings are served. The right-of-way cannot be less than 20 feet.
(2) Dead-end streets (Cul-de-sacs).
(a) Collector streets - dead-end. Minor collector streets over 1,000 feet long on all classifications of land and permanently dead-end shall be provided with a turnaround having a radius at the outside of the right-of-way of at least 50 feet.
(b) Minor streets - local.
l. Type I land. Streets which are designed so as to have one end permanently closed shall not be longer than 600 feet and shall be provided at the closed end with a turnaround having a radius at the outside of the right-of-way of at least 50 feet.
2. Type II and III land. Streets which are designed so as to have one end permanently closed shall not be longer than 1,000 feet and shall be provided at the closed end with a turnaround having a radius at the outside of the right-of-way of at least 40 feet. Where a circular turnaround cannot be constructed due to topographical conditions, a “T” turnaround shall be permitted. The right-of-way at the “T” turnaround shall be at least 50 feet deep from the right-of-way centerline, and 20 feet wide in the extensions.
3. Type IV land. The standards for Type II and III land shall apply to Type IV land; however, where five or fewer dwelling units are served, the standards may be lowered.
(3) Extended streets. The street system for the proposed subdivision shall provide for extending streets at the same or greater width, but in no case shall a street extension be of less width than the minimum width required in these regulations for a street in its category, except where in the opinion of the Planning Commission topographical conditions do not permit the extension.
(4) Existing streets.
(a) Subdivision on both sides of street. Where the subdivision is on both sides of an existing street, sufficient right- of-way shall be dedicated to give the street the required right-of-way.
(b) Subdivision on one side of street. Where the subdivision is to take place on only one side of a street, one-half of the right-of-way needed to give the street the required right-of-way shall be dedicated.
(5) Streets along property lines. Where a proposed street runs along a property line of the proposed subdivision, the street right-of-way pavement and other requirements must be met in full.
(6) Cut or fill. Where a cut or fill road slope is outside the normal right-of-way of the street, a slope easement shall be provided of sufficient width to permit maintenance of the slopes.
(7) Split roadways. Where a split roadway better preserves the natural topography of the land, a split roadway shall be used and additional right-of-way shall be granted equal to the separation.
(8) Commercial areas. If the Planning Commission deems it necessary, street rights-of-ways through commercial areas or present or proposed business areas shall be increased ten feet on each side for needed parking.
(9) Extraordinary physical conditions. If the Planning Commission deems it necessary where extraordinary physical conditions exist, the Planning Commission may alter the right-of- way requirements.
(10) Maximum dedication The city's comprehensive plan may indicate greater right-of-way widths for certain arterial streets, but in no case shall the subdivider be required to dedicate a right-of-way of more than 84 feet for any one street.
(G) Additional streets required.
(1) Marginal access streets. Where the proposed subdivision abuts upon or contains an existing or proposed arterial street or highway on which traffic volumes and vehicular speeds warrant special safety considerations, the Planning Commission may require that marginal access streets be provided in order that no lots will front on the existing or proposed arterial street or highway.
(2) Alleys. Alleys may be provided to give access to the rear of all lots used for business and industrial purposes. Alleys shall not be provided in residential blocks except in cases where the subdivider produces evidence of the need for alleys which is satisfactory to the Planning Commission.
(3) Conflicting traffic or land use. When a proposed subdivision contains or is adjacent to existing or proposed railroad rights-of-way, arterial street right-of-way, other significant rights- of-way, or conflicting and detrimental land uses, the Planning Commission may require marginal access streets, reverse frontage lots, lots with rear service alleys, lots with additional depth, or other measures which may be necessary for protection of abutting properties and the maintenance or function of major traffic arteries.
(H) Private streets and reserve strips.
(1) There shall be no private streets platted within a subdivision.
(2) There shall be no reserve strips in a subdivision except where their control is definitely vested in the city or county under conditions approved by the Planning Commission as authorized in this chapter.
(I) Street intersections.
(1) Number of approaches. Intersections involving more than four basic street approaches shall be prohibited. Merging lanes and deceleration lanes are considered as parts of one street approach.
(2) Angle at intersection.
(a) Type I land. For a tangent distance of at least 100 feet, measured from the intersection of right-of-way lines, all streets should intersect at an angle of 90 degrees. In no case shall the angle of intersection be less than 75 degrees.
(b) Type II, III, and IV land. Intersections on these types of land shall be dictated by topography. The standards contained in division (A) above shall be used when possible.
(3) Radii at intersections.
(a) Type I land. Street curb and edge intersections shall be rounded by radii of at least 20 feet.
(b) Type II, III, and IV land . Street curb and edge intersections shall be rounded by radii of at least 10 feet.
(4) Street jogs.
(a) Type I land. Street jogs with centerline offsets of less than 150 feet shall not be made.
(b) Type II, III, and IV land. Street jogs with centerline offsets of less than 150 feet shall not be made into arterial streets. On all other streets, where topographical conditions indicate, placement of street jogs with centerline offsets of less than 150 feet may be permitted.
(J) Horizontal curves.
(1) Reverse curves.
(a) Type I land. A tangent at least 100 feet long shall be introduced between reverse curves on arterial and collector streets.
(b) Type II, III, and IV land. The above standards contained in division (a) above shall apply for arterial streets. Other streets should be designed so as to follow contours.
(2) Curve radius. Where there is a deflection angle of more than ten degrees in the alignment of a street, a curve with a radius adequate to ensure safe sight distance shall be made. The minimum radii or curves shall be:
Type I Land
Type II, III, and IV Land
(K) Vertical curves. All changes in grade for streets shall be connected by a vertical curve of a minimum length necessary to provide adequate sight distance and other safety factors. To calculate the minimum length for the curve connecting changes in grade:
(1) Calculate the algebraic difference in grades.
(2) Multiply by the appropriate value.
(a) Values for crest curve:
Arterial and collector streets 50
Minor street 28
(b) Values for sag curve:
Arterial and collector streets 50
Minor streets 35
(L) Street grades.
(1) Maximum grades. Street grades shall conform to the following:
Type I Land
Type II, III, and IV Land
In addition, minor streets may have a grade of 20% for a distance of no more than 500 feet. However, driveways or other access shall not be allowed to enter a section of street which has a grade in excess of 15%
(2) Grades for drainage. All streets shall be designed so as to provide for the discharge of surface water from the pavement and from the right-of-way by grading and drainage. For adequate drainage, the minimum street grade shall not be less than 0.5%.
(3) Excessive grades at intersections. When a street grade at the approach of an intersection exceeds 3%, a leveling area shall be provided with grades of not greater than 3% for a distance of 50 feet from the intersection of street centerlines. Vertical curves shall then be used to connect the intersecting grades.
(M) Street elevations.
(1) The Planning Commission shall not approve streets which will be subject to inundation or flooding. All streets must be located at elevations which will make them flood-free in order that portions of the subdivision will not be isolated by floods. Where flood conditions exist, the Planning Commission shall require profiles and elevations of streets in order to determine the advisability of permitting the proposed subdivision activity.
(2) Fill may be used in areas subject to flooding in order to provide flood-free streets if the fill does not unduly increase flood heights. Drainage openings shall be designed so as not to restrict the flow of water and thereby unduly increase flood heights. Fills and drainage openings shall be approved by the City Engineer.
(N) Street names.
(1) Proposed streets which are obviously in alignment with already existing and named streets shall bear the names of the existing streets.
(2) The name of a proposed street which is not in alignment with an existing street shall not duplicate the name of any existing street, irrespective of the use of the suffix street, avenue, boulevard, drive, place, court, land, road, pike, highway, parkway, or similar suffix.
(Ord. 930.1, passed 3-15-71) Penalty, see § 155.99