14.12.080: CUL-DE-SACS:

   A.   Right Of Way Radius: Cul-de-sacs and turnarounds shall have a minimum right of way radius of fifty feet (50') in residential areas and sixty feet (60') in commercial and industrial areas. A circular left hand offset is desirable.

   B.   Hammerhead And Similar Turnarounds: Hammerhead, "L", "Y" and "T" turnarounds shall only be allowed when approved by the city planning commission upon written recommendation and design review of the department.

   C.   Temporary For Stub Streets: A temporary turnaround for stub streets in excess of one hundred fifty feet (150') long shall be provided where the extension of a street is planned and anticipated.

   D.   Length: The length of a cul-de-sac shall vary inversely with density to accommodate a maximum of twenty five (25) lots and shall not be longer than one thousand feet (1,000'). (1999 Code)

14.12.090: ROADWAY DESIGN:

   A.   Maximum Vertical Grades: All vertical grades shall be a maximum of ten percent (10%).

   B.   Minimum Vertical Grade And Crown Slope: A minimum vertical grade of four-tenths of one percent (0.4%) and a minimum crown slope of two percent (2%) shall be provided for adequate drainage of runoff.

   C.   Vertical Crest Grades: All approach legs of intersections shall provide vertical crest grades not to exceed two percent (2%) for a distance of at least fifty feet (50') from right of way line of intersecting streets.

   D.   Crest Length: The length of crest and sag vertical curbs shall be designed in accordance with AASHTO guidelines.

   E.   Vertical And Horizontal Curves: Vertical and horizontal curves shall be designed to provide a minimum stopping sight distance in accordance with AASHTO guidelines using the design speeds listed below. Decision sight distances, however, may be required as outlined in AASHTO's guidelines where more complex driver information error is likely to occur.

   F.   Design Speeds: All roadways shall be designed in accordance with the following design speeds using AASHTO's guidelines, principles, and practices:

      1.   Local: Twenty five (25) miles per hour;

      2.   Collector: Forty (40) miles per hour;

      3.   Arterial: Fifty (50) miles per hour.

   G.   Super Elevation: Super elevation rates above 0.06 foot/foot shall be prohibited to minimize slipping across a roadway when stopped or attempting to slowly gain momentum from a stopped position. Super elevation will not be allowed on local residential streets.

   H.   Circular Curve: Where a centerline deflection angle of more than ten degrees (10o) occurs, a circular curve shall be introduced. There shall be a tangent of at least fifty feet (50') on local streets and one hundred feet (100') for collectors and arterials between reverse curves. (1999 Code)

14.12.100: MINIMUM RIGHT OF WAY AND PAVEMENT DESIGN:

   A.   Pavement Width And Design: The minimum pavement width and pavement design standards shall be provided as follows:

 

	Right Of Way Width	Pavement Width	Minimum Design Section
Local	42'	25'	8" base 3" asphalt
Local	50'	25'	8" base 3" asphalt
Collector	60'	35'	8" base 3" asphalt
Collector	66'	41'	8" base 3" asphalt
Collector	80'	55'	10" base 4" asphalt
Arterial	106'	55' - 81'	12" base 6" asphalt

 

   B.   Geotechnical Specifications: All roadway sections shall be designed in accordance with specific geotechnical specifications acceptable to the city. Such geotechnical specifications shall be paid for by the applicant. The city shall required analysis and additional design requirements when unusual site or traffic conditions exist. (1999 Code)

14.12.110: DRIVEWAY APPROACHES:

   A.   Commercial, Industrial, Manufacturing And Multiple-Family Uses: Requirements for commercial, industrial, manufacturing, and multiple-family uses requiring motor vehicle access shall meet the requirements as hereinafter provided:

      1.   Access shall not be by more than one driveway approach for each one hundred feet (100') of frontage on any street. The city planning commission or staff where specifically delegated, may modify this requirement when considering a particular site plan in those cases where the commission or staff determines that the safety and convenience of the general public would be better served by more or less driveway approaches.

      2.   Wherever possible, abutting sites should share driveway approaches.

      3.   Additional driveway approaches may be warranted by table 3-A of this section for on center spacing of driveway approaches:

TABLE 3-A
RECOMMENDED DRIVEWAY APPROACH SPACING

 

Median Barrier	Principal Arterial	Arterial	Collector
No	250 feet	200 feet	175 feet
Yes	185 feet	115 feet	85 feet

 

      4.   No two (2) of said driveway approaches shall be closer to each other than fifty feet (50').

      5.   No driveway approach shall be closer than one hundred feet (100') to the point of intersection of the two (2) property lines at any corner. If there is not one hundred feet (100') of frontage, then the driveway approach will be placed five feet (5') from the property line furthest from the intersection of the property lines, if the nearest existing driveway approach is fifty feet (50') or further away. In no instance shall a driveway approach be closer than sixty feet (60') from the projected intersection right of way lines with a minimum of five foot (5') flared section. Flared driveway approaches are required for distinction from intersection corners.

      6.   The minimum width of a driveway approach shall be twelve feet (12') and the maximum shall be thirty feet (30').

      7.   The community development director may approve a driveway approach up to a maximum of fifty feet (50') wide.

   B.   Single-Family Dwellings: Single-family dwellings shall meet the following requirements as hereinafter provided:

      1.   Single-family dwellings shall be permitted only one access unless a circular driveway approach is utilized.

      2.   There shall be a minimum of thirty five feet (35') between the entrances of circular driveway approaches and the two (2) closest edges of the driveway approach.

      3.   Corner lots will be allowed to have one driveway approach per street frontage.

      4.   There shall be a minimum ten feet (10') distance between all approved driveway approaches except on cul-de-sacs.

      5.   The minimum street driveway approach width at the property line shall be ten feet (10') and the maximum shall be thirty feet (30').

      6.   A minimum five foot (5') radius or flared section shall be used.

      7.   No radius or flare portion of a driveway approach shall intersect the abutting projected property line except where shared approaches are utilized.

      8.   On corner lots, driveway approaches shall be set back a minimum of twenty five feet (25') from the point of intersection of the right of way lines.

   C.   Grades: All driveway approach grades shall not exceed four percent (4%) within twenty feet (20') of the roadway boundary.

   D.   Approaches: Approaches shall be a minimum of five feet (5') from a side property line at the front lot line except on cul-de-sacs. (Ord. 2015-15, 10-8-2015)

14.12.120: INTERSECTION DESIGN:

   A.   Minimum Radius: The minimum radius of curb return on local streets in residential areas shall be twenty five feet (25'). A larger radius shall be used in industrial areas or higher functional classification streets as approved by the department or its designee in accordance with AASHTO guidelines.

   B.   Angle Of Intersect: Streets shall intersect at an angle of ninety degrees (90o) where possible, but in no case shall the angle of intersection be less than eighty degrees (80o).

   C.   Offset Intersections: Offset intersections shall be avoided whenever possible and offsets shall be provided with minimum distances as follows:

      1.   Local streets: One hundred fifty feet (150');

      2.   Collectors: Five hundred feet (500');

      3.   Arterials: Eight hundred feet (800').

   D.   Left Turns: Left turns shall be prohibited within two hundred feet (200') of major intersections either by signs or concrete medians. (1999 Code)

14.12.130: PRIVATE ROADWAYS:

   A.   Width: The width of all private roadways shall consist of a minimum of twenty feet (20') of unobstructed travel surface. Roadways shall be twenty five feet (25') wide where they form cul-de-sacs greater than five hundred feet (500') in length. Short sections may be reduced to preserve trees or other features as approved by the fire department.

   B.   Surfaces: All surfaces shall consist of an approved design capable of carrying twenty four (24) ton vehicles.

   C.   Compliance Required: Except as modified by subsections A and B of this section, all private roadways shall comply with the requirements of this chapter and Appendix D: Fire Apparatus Access Roads, as provided by the International Fire Code.

   D.   Maintenance And Repairs: Appendix D, Fire Apparatus Access Roads as printed in the 2018 IFC (International Fire Code) is hereby adopted by reference and incorporated as if printed herein in full. (1999 Code; amd. Ord. 2021-30, 12-2-2021)

14.12.140: STREET DIRECTION AND GRADE:

(Rep. by Ord. 2015-15, 10-8-2015)