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4-1. Integrating the County Classification System into the Roadway Design Process

It is the policy of Humboldt County that design will be based upon the following roadway classification, use and level of service factors.

The Director of Public Works is responsible for placing roads serving subdivisions into one or more of the following roadway categories:

a. ROADWAY CATEGORY #1.

(1) Single lane - low speed, less than 20 mph.

(2) No parking permitted on traveled way.

(3) Maximum length - 1/4 mile.

(4) Serves maximum of four (4) parcels having no more than one dwelling unit per parcel.

(5) Rural area only.

b. ROADWAY CATEGORY #2.

(1) Single lane - with intervisible turnouts not to exceed 1/4mile spacing.

(2) No parking on traveled way.

(3) Serves a maximum of ten (10) parcels having no more than one dwelling unit per parcel.

(4) Rural area only.

(5) Low speed - 25 mph design.

c. ROADWAY CATEGORY #3.

(1) Single land - will allow for vehicles to pass each other at slow speeds.

(2) No parking on traveled way.

(3) Serves a maximum of 20 parcels having no more than one dwelling unit per parcel.

(4) Rural situations - low density area.

(5) Low speed - 25 mph design.

d. ROADWAY CATEGORY #4.

(1) Two lane - narrow roadway, low to moderate speed - 25-40 mph.

(2) No parking on traveled way.

(3) Serves a maximum of 100 parcels with no more than one dwelling unit per parcel.

(4) Urbanization situation. Vicinity is beginning to undergo a transition from rural to urban.

e. ROADWAY CATEGORY #5.

(1) Full two lane with at least two 4-foot shoulders.

(2) No parking on traveled way.

(3) Urban or urbanizing area. Vicinity normally will have intermittent high density lots and large lots or acreage.

f. ROADWAY CATEGORY #6.

(1) Full two lane with at least two 8-foot parking lanes.

(2) Provides on-street parking and/or sidewalks as approved byDepartment of Public Works.

Topography or design may require deletion of parking on one side as approved by Department of Public Works.

(3) Urban area.

4-2. Guidelines for Determining Roadway Categories

a. If on-street parking is expected, then a parking lane must be provided. The parking lane need not accommodate more than three (3) vehicles if the lot frontage exceeds 120 feet. If the subdivider does not provide for on-street parking, the topography of the lots must permit normal site development and provide room for the parking of five (5) vehicles.

b. Applicant is responsible for all drainage requirements.

c. In estimating average daily traffic (ADT), the number of lots served by the road in urban or urbanizing areas shall be multiplied by eight (8). In rural areas, the number of lots served by the road shall be multiplied by five(5).

d. Upon satisfactory completion, roads constructed in accordance with standards of Categories 4 through 6 would qualify for inclusion into the County maintained road system. Roads under Category 3 would qualify if surfaced with seal coat or asphalt. Roads under Categories 1, 2 and 3 (if gravel) would be considered on an individual basis. Consideration would be given to building setbacks, area's density, length of road, size of parcels, if it connected to a public maintained road, and public use.

e. Nothing herein permits the submittal of subdivision improvement plans which do not reflect sound engineering judgment and practices. The subdivider's engineer shall certify that all subdivision improvement plans represent sound engineering judgment and practices.

f. Dead end roads shall have an adequate turnaround at their termination.

g. Design standards herein are not intended to be all inclusive. The Roadway Categories contained in this Appendix are excerpts from the County DesignManual. The County and State Design Manuals should be referred to, when applicable. All work, including water and sewer lines, shall conform to theState Standard Specifications.