Alaska Stat. § 19.30.161
Design standards, rights-of-way, and widths for each local service road and trail project must have the prior approval of the commissioner, unless the project is under the supervision of a local government that has assumed local road powers. Where approval is required the commissioner must make a decision within 90 days after the Department of Transportation and Public Facilities receipt of the local government's request. If the project is under the supervision of a local government that has assumed road powers and the project is not located on a federal-aid secondary route, design standards, rights-of-way, and widths shall be established by the local government. If a project under the supervision of a local government that has assumed road powers is located on a federal-aid secondary route, design standards, rights-of-way, and widths must have the prior approval of the commissioner.
AS 19.30.161