(a) Design. Maximum allowable grades, minimum requirements for vertical curves, and all other design standards shall meet the requirements of the City Engineer and, where applicable, the County Engineer. The City of Ashland Standard Specifications shall apply to all improvements constructed in accordance with the provisions herein.
The following standards are given as a general guide only and are subject to approval in specific application:
(1) Curves (horizontal and vertical), sight distance and speed.
A. A tangent of at least 100 feet shall be provided between reverse curves.
B.
Minimum Radius of Centerline (ft.) | Minimum Stopping Sight Distance (ft.) | Design Speed (m.p.h.) | |
Primary streets | As specified | As specified | As specified |
Secondary streets | 500 | 350 | 50 |
Collector streets | 400 | 300 | 40 |
Rural streets | 150 | 235 | 35 |
Minor streets | 150 | 235 | 35 |
Cul-de-sacs and loop streets | 50 | 150 | 25 |
Alleys | 50 | 150 | 20 |
C. All changes in grade shall be connected by a vertical curve to provide the required sight distance specified above as well as a smooth riding surface and shall be not less than twenty-five times the algebraic difference in grades for primary, secondary and collector streets and not less than twenty times the difference in grade in all other streets.
(2) Street grades.
Percent Grade | ||
Street Type | Max. Allowable (in percent) | Max. Desirable (in percent) |
Primary streets | 5 | 4 |
Secondary street | 7 | 5 |
Collector | 8 | 6 |
Rural streets | 9 | 7 |
Minor streets | 9 | 7 |
Cul-de-sacs and loop streets | 15 | 10 |
Alleys | 15 | 10 |
Minimum allowable grade for any street or alley 0.4
(3) Street elevations. The Planning Commission shall not approve streets which will be subject to inundation of flooding. All streets shall be located at elevations which shall make them flood-free in order that such portions of the subdivision shall not be isolated by floods. Where flood conditions exist, the Commission shall require profiles and elevations of streets in order to determine the advisability of permitting the proposed subdivision activity.
(4) Intersections. Detailed intersection drawings shall be submitted for the approval of the City Engineer and, where applicable, the County Engineer. The minimum curb radius at intersections shall be twenty-five feet unless otherwise approved. The minimum angle of intersections shall be 75° (90° preferred), and this alignment shall not change for a minimum distance of 100 feet beyond the point of intersection of the centerlines. Intersection design shall be commensurate with the classification of streets.
(5) Design load and vertical clearance. The design load for all structures shall be HS-20, and the minimum vertical clearance above all roadways shall be fourteen and one-half feet.
(b) Minimum Widths. The minimum width of the improved or traveled portion (face to face curb, where applicable) required shall be as follows:
Street Type | Minimum Width (in feet) |
Primary street | 48 |
Secondary streets | 40 |
Collector streets | 34 |
Rural street | 24 |
Minor streets | 30 |
Loop streets | 26 |
Cul-de-sacs | 26 with 80 foot minimum diameter at turn-around joined to pavement edge by a tangent radius of 65 feet |
Alleys | 18 |
Crosswalkways | 6 |
Sidewalks, minimum | 4 (a greater width may be required by the City Engineer) |
(c) Pavement, Typical Section.
(1) Surface and base. The surface and base of all streets and alleys shall be in accordance with the standard typical sections on file in the office of the City Engineer.
(2) Curbing or curb and gutter. Curbing or curb and gutter shall be constructed on all streets, excluding alleys; however, on streets where adequate drainage can be provided without curbs or curb and gutter and where the minimum lot frontage is 150 feet or, where justified by Section 1115.06
, the Commission may waive this requirement.
(d) Street Name or Number Signs. The developer shall pay to the City or, where applicable, the County the entire cost of constructing street name or number signs. This cost shall be paid before the final plat is approved.
(e) Streets for Commercial Subdivisions. Streets serving business developments and accessory parking areas shall be planned to connect with primary or secondary streets so as not to generate traffic on local streets. The intersections of driveways from parking areas with primary, secondary or collector streets shall be located so as to cause the least possible interference with traffic movement on the streets and shall be located not less than 100 feet from the intersection of a primary, secondary or collector street with any other street and shall be spaced not less than 200 feet from each other. The Commission may require marginal access streets to provide maximum safety and convenience.
(f) Streets for Industrial Subdivisions. Collector streets for industrial subdivisions shall be planned to serve industrial areas exclusively and shall connect with primary or secondary streets so that no industrial traffic shall be directed into any residential streets. The intersections of service streets from parking areas with primary, secondary or collector streets shall not be less than 100 feet from the intersection of the primary, secondary or collector street with any other street. Streets shall be planned to be extended to the boundaries of any adjoining land planned for industry, except for severe physical conditions or if the Commission finds such extension is not in accord with the approved plan of the area.
(Ord. 39-81. Passed 10-7-81.)
(g) (1) Sidewalks. Sidewalks shall be constructed along the entire frontage and sideyard adjacent to side streets. An occupancy certificate shall not be issued unless a sidewalk is constructed, unless construction thereof is waived, or the time for construction is extended, as hereinafter provided. In the event no waiver is granted, sidewalks shall be installed not later than four years after acceptance by Council of the plat pertaining to such property or within one year after eighty percent (80%) of the lots within the platted area have been issued occupancy permits, whichever is earlier. All sidewalks shall be of concrete and shall be five feet wide and four inches thick, except that sidewalks shall be six inches thick across driveways. All sidewalks shall be situated with the outside edge twelve inches from the street right-of-way line and shall be constructed in accordance with the standards, specifications and requirements established by the City Engineer and, where applicable, the County Engineer. The area between the top of the curb and the sidewalk, or property line where a sidewalk is not required, shall be fine graded with a slope of one-half inch per foot toward the curb. All drives shall be constructed to conform to the sidewalk or future sidewalk grade. (See Section 1115.03
(a).
(Ord. 17-89. Passed 4-18-89; Ord. 58-03. Passed 6-3-03.)
(2) Waiver. A waiver of the requirement as set forth in the preceding subsection (g)(1) hereof may be obtained pursuant to the following provisions:
A. An application for a sidewalk waiver shall be submitted to and upon the form as provided by the Division of Engineering, which application must be accompanied by diagrams and a complete explanation of reasons for the waiver request.
B. Application shall be considered by Council and a determination shall be made by a majority thereof.
(Ord. 17-89. Passed 4-18-89.)
C. Factors to be considered in determining whether a waiver shall be granted shall include, but not be limited to, terrain, engineering difficulties, dimensions of lot, absence of adjacent sidewalks (only in areas platted before 1988 - "Platted," for this purpose, means that the lots and streets of an allotment plan have been approved by the Planning Commission and Director of Engineering, offered for dedication, accepted by Council for dedication and recorded in the office of the County Recorder as so dedicated and accepted), any unusual circumstances and any other matters which may be relevant to a determination of the application.
(Ord. 55-92. Passed 10-6-92.)
D. Council may grant either a complete waiver of the sidewalk requirement, may grant a temporary extension of time for compliance with the sidewalk requirement or may modify the construction specifications upon the recommendation of the Director of the Engineering Division.
(Ord. 17-89. Passed 4-18-89.)
(h) Crosswalkways. Crosswalkways shall conform to the requirements for sidewalks except for width, grade and alignment.
(Ord. 39-81. Passed 10-7-81.)