The department on behalf of the state and as part of the cost of constructing or maintaining a highway may purchase in the open market, acquire, take over, or condemn under the right and power of eminent domain land in fee simple or easements that it considers necessary for present public use, either temporary or permanent, or that it considers necessary and reasonable for the public use. By the same means, the department may obtain material, including clay, gravel, sand, or rock, or the land necessary to obtain material, including access to it. The department may acquire the land or materials notwithstanding the fact that title to it is vested in the state or a department, agency, commission, or institution of the state. Acquisition of materials by purchase in the open market under this section is governed by AS 36.30 (State Procurement Code).