17.56.080 Right-of-way – Trafficway width.
A. All rights-of-way shall be of sufficient width to contain all road construction.
B. Minimum right-of-way, trafficway, and shoulder width (expressed below in feet) shall be as follows:
Minimum Road Design Standards*
Right-of-Way/
Trafficway Widths
|
Road Classification |
Minimum R.O.W. |
Minimum Trafficway Width |
Minimum Shoulder |
|---|---|---|---|
|
Local 11 |
40 |
18 |
2 |
|
Local 22 |
50 |
20 |
2 |
|
Minor collector |
60 |
20 |
2 |
|
Major collector |
80 |
24 |
2 |
|
Arterial |
100 |
24 |
2 |
|
Frontage road |
40 |
24 |
2 |
|
Alley |
20 |
16 |
0 |
|
Pioneer access road |
40 |
16 |
0 |
1Serve 10 or fewer residential lots, with a maximum length of 1,320 feet.
2Road within residential subdivisions which provide or support access to 11 to 40 lots and do not function as minor collectors.
*Based on topography and potential development, greater minimum standards may be required.
C. Road Shoulder. For all roads except pioneer access roads and alleys, the applicant shall provide two feet of shoulder width to each side of the trafficway width and shall surface it with the same material as the base. The slope of the shoulder shall not exceed 4:1.
D. Roads that do not connect to adjacent roads shall end in a cul-de-sac or temporary turnaround.
E. Cul-de-Sac and Turnaround Requirements.
1. Roads ending with cul-de-sacs may be used in subdivision design as follows:
a. Where internal road circulation is restricted by topography or adjacent land use;
b. As a desirable traffic design characteristic.
2. Roads ending with cul-de-sacs shall not exceed 900 feet in length as surveyed from road intersection to centerpoint of cul-de-sac except as follows:
a. If conditions warrant a cul-de-sac road longer than 900 feet, the minimum trafficway shall be 20 feet wide the entire length;
b. In no case shall the cul-de-sac length exceed 1,320 feet.
3. Permanent or temporary turnarounds shall be constructed to provide a minimum turning diameter of 85 feet contained within a 100-foot diameter right-of-way or, when necessary, contained within a right-of-way sufficient to encompass all road construction.
4. All permanent turnarounds shall have 25-foot minimum radius curve returns between the turnaround bubble and the parallel right-of-way lines to which it attaches. (Ord. 2016-40 § 72, 2016; Ord. 2005-33 § 11, 2006; Ord. 2005-10 § 2, 2005. 2004 Code § 17.60.130.)