10.12.130 Minimum right-of-way and roadway widths.
Street rights-of-way and improvements shall be according to the widths in Table 1:
|
TYPE OF STREET1 |
Standard Right-of-Way |
Alternative Minimum Right-of-Way |
Minimum Pavement Width |
Minimum Travel Lane Width |
Minimum Center Turn Lane/Median |
Bike Lane |
On-Street Parking |
Sidewalk |
|---|---|---|---|---|---|---|---|---|
|
Arterial | ||||||||
|
5-lane | 100' | 92' | 66' | 11' – 12' | 12' – 14' | 5' – 6' | – | 6' – 10' |
|
3-lane | 80' | 70' | 44' | 11' – 12' | 12' – 14' | 5' – 6' | – | 6' – 10' |
|
Collector | ||||||||
|
3-lane | 80' | 70' | 44' | 11' | 12' | 5' – 6' | 8' | 6' – 8' |
|
2-lane | 60' | 50' | 30' | 11' | – | 5' – 6' | 8' | 6' – 8' |
|
Local Roads2 | 54' | 48' | 28' | 10' | – | – | 8' | 5' |
|
Service and Industrial | 80' | 60' | 40' | 12' | – | – | 8' | 6' – 8' |
|
Alley | 16' | – | 12' | 12' | – | – | – | – |
1Freight routes shall have a minimum lane width of 12 feet and bus routes shall have a minimum lane width of 11 feet unless otherwise approved by the public works director.
2“Local roads” include dead-end streets (cul-de-sac and hammerhead). Minimum dimensions for cul-de-sac are: right-of-way radius 50 feet and minimum roadway surface of 40 feet radius. Minimum dimensions for a hammerhead turnaround are: right-of-way 50 feet by 70 feet and minimum roadway surface 30 feet by 50 feet.
(1) Variances. Where existing conditions, such as the topography, the size or shape of property, or constraints posed by sensitive lands (i.e., wetlands) make it otherwise impractical to meet these minimum standards, then a variance may be granted to accept a narrower right-of-way pursuant to NBCC 10.12.180.
(2) Turn Lanes/Medians. Turn lanes and/or center medians are required on five-lane arterials and optional for three-lane arterials.
(3) Alignment. As far as practical, all streets other than minor streets shall be in alignment with existing streets by continuations of the center lines thereof. Staggered street alignment resulting in “T” intersections should wherever practical leave a minimum distance of 200 feet between the center lines of streets having approximately the same direction.
(4) Future Extension of Streets. Streets shall be platted to the furthest boundary of the lot or parcel in order to provide access to or permit a satisfactory future development of adjoining land. Resulting dead-end streets may be approved without a turnaround if they are less than 150 feet in length. If longer than 150 feet, then a temporary turnaround (i.e., hammerhead or cul-de-sac) shall be constructed. A stub street may be required to preserve the objectives of street extensions. The cul-de-sac or dead-end street shall provide, or not preclude the opportunity to later install, a pedestrian and bicycle pathway between it and adjacent developable lands. Such pathways shall conform to NBCC 10.12.140.
(5) Intersection Angles. Streets shall be laid out to intersect at angles as near to right angles as practical except where topography or the existing development pattern requires a lesser angle, but in no case less than 60 degrees unless there is a special intersection design. Streets shall have at least 50 feet of tangent adjacent to the intersection unless topography requires a lesser distance. Intersections which are not right angles shall have a minimum corner radius of 20 feet along the right-of-way lines of the acute angle. All right-of-way lines at intersections with arterial streets shall have a corner radius of not less than 20 feet.
(6) Street Names. Except for extensions of existing streets, no street names shall be used which will duplicate or be confused with the names of existing streets. Street names shall conform to the established pattern in the city and the surrounding area and shall be subject to the approval of the planning commission.
(7) Grades. Street grades shall be established by ordinance pursuant to Chapter 12.16 NBCC. Street grades shall not exceed seven percent on arterials, 10 percent on collector streets, or 12 percent on any other street. Street grades may exceed these maximum standards for short distances (less than 200 feet) if it is determined that topography and/or existing development makes meeting these standards impractical. In no case shall the maximum street grade exceed 18 percent. In flat areas allowance shall be made for finished street grades having a minimum slope of one-half percent. Streets intersecting with a collector or greater functional classification street, or streets intended to be posted with a stop sign or signalization, shall provide a landing area of at least 20 feet long and averaging five percent or less.
(8) Curves. Center line radii of curves shall not be less than 300 feet on major arterials, 200 feet on secondary arterials, or 100 feet on other streets, except when topography or existing development justifies a variation to this standard.
(9) Streets Adjacent to Railroad Right-of-Way. Wherever the proposed development contains or is adjacent to a railroad right-of-way, provisions may be required for a street approximately parallel to and on each side of such right-of-way at a distance suitable for the appropriate use of the land between the streets and the railroad. The distance shall be determined with due consideration at cross streets of the minimum distance required for approach grades to a future grade separation and to provide sufficient depth to allow screen planting along the railroad right-of-way.
(10) Marginal Access Streets. Where a development abuts or contains an existing or proposed arterial street, the planning commission may require marginal access streets, reverse frontage lots with suitable depth, screen planting contained in a nonaccess reservation along the rear or side property line, or other treatment necessary for adequate protection of residential properties and to afford separation of through and local traffic.
(11) Alleys. Alleys may be provided in commercial and industrial districts. Other permanent provisions for access to off-street parking and loading facilities may be approved by the planning commission. The corners of alley intersections shall have a radius of not less than 12 feet. (Ord. 2048 §§ 3, 4, 2021; Ord. 1919 § 13, 2004)