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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 />1. The location of proposed streets shall allow for the proper conveyance of <br />the storm drainage system. <br />2. Where a street is indicated to dead end into an adjacent unplatted area, the <br />developer shall provide written approval from the adjacent landowner to <br />discharge his storm drainage from the street onto the adjacent land if such <br />drainage occurs. <br />3. Stub streets shall end at the property line with a cul-de-sac unless the <br />Engineer recommends otherwise. <br />4. Type III barricades shall be permanently installed at the end of all stub <br />streets that do not end in a cul-de-sac. <br />The County Engineer may determine that the AASHTO's Policy on Geometric Design of <br />Highway and Streets, current edition, can be substituted for the WSDOT Design Manual <br />on a case -by -case basis. <br />Table 4-1 <br />Roadway and Right -of -Way Width Requirements <br />a 40 MPH Design Speed > 40 MPH Design Speed <br />ADT' Roadway Width, ROW Width Roadway Width2 ROW Width <br />0-400 ADT 24 60 26 60 <br />Less than 400 ADT 26 60 26 60 <br />'ADT to be determined using the most recent edition of the ITE Trip Generation manual. <br />,Additional roadway or shoulder width may be required on roads with steep side slopes or roads <br />designated as bicycle routes in the Long -Range Transportation Plan. <br />a`e +- <br />BST Surfacing and Structural Requirements <br />