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12.04.020 General. <br />The provisions stipulated in this section are general in nature and shall be considered as applicable <br />to all parts of these specifications, including any supplements and revisions. <br />All road construction within the public or private right-of-way shall be designed by or under the <br />direct supervision of a civil engineer, licensed to practice in the State of Washington as required <br />by KCC 12.08. All drawings and support data submitted to the County for approval must bear his/her <br />seal and signature. The design criteria, as presented, are intended to aid in preparation of plans and <br />specifications, and shall be considered as minimum standards. <br />As with any design criteria, occasions may arise where the minimum standards are either <br />inappropriate or not feasible due to unusual circumstances. In these cases a variance to these criteria <br />shall be considered. Variance requests shall follow the procedures outlined in KCC 12.01.130. (Ord <br />2015-010. 2015) <br />12.04.030 Public Road Design Requirements. <br />A. Road surfacing requirements shall be in accordance with the WSDOT Pavement Guide, <br />Volume 1 - Pavement Policy, current edition, and tables 4-1 through 4-3 of this chapter. <br />B. The minimum design speed for all roads shall be 25 MPH. Design speeds shall be based <br />upon WSDOT Design Manual, current edition. Entire road segments shall be designed at <br />the same speed. <br />C. Intersections <br />1. Location of new arterial and collector streets shall be in accordance with the <br />WSDOT Design Manual. <br />2. All new intersections will have a minimum straight tangent length prior to <br />beginning any curves in accordance with the WSDOT Design Manual. <br />3. The design of intersections on arterial streets shall be in accordance with <br />WSDOT Design Manual. <br />4. Separation of intersections shall be in accordance with WSDOT Design <br />Manual. <br />D. Residential streets should be designed to direct traffic to collector streets and <br />adequately provide for circulation and movement within the subdivision. <br />E. Vertical Alignment - Connection with existing streets shall be smooth transitions and <br />existing grades shall be shown for at least 150 ft on all sides of the connection. Vertical <br />alignment designs shall be in accordance with the applicable WSDOT or AASHTO <br />Design Manual. <br />F The grade and ground lines of all streets that dead-end, except cul-de-sacs, shall be <br />continued for 500 ft beyond the proposed construction, unless that property is under <br />different ownership. The grade and ground lines of all arterials shall be designed to <br />continue 1000 ft beyond the end of proposed construction unless that property is under <br />different ownership. <br />G. Sight Triangle Standards shall be in accordance with the WSDOT Design Manuals. Site <br />triangles shall be shown on the preliminary and final land segregation documents. Site <br />triangles shall apply to all private and public roads. Plat notes and covenants shall reflect <br />that site triangles shall be kept free of all trees, bushes, landscaping, fences or obstacles. <br />H. Street Projections into Future Adjoining Subdivisions. <br />