; (2) recommendations on how to facilitate the development of facilities for solar energy generation, solar energy storage, and solar energy transmission or distribution on available Federal land adjacent to the National Highway System; (3) the identification of Federal requirements for developing such facilities on available Federal land adjacent to the National Highway System, including any safety or environmental issues involved in developing such facilities and the steps required to mitigate such issues; and (4) recommendations for a process for entities to apply to the Department of Transportation and the Department of Energy for a lease, an easement, or a joint-use agreement to build and operate such facilities on available Federal land adjacent to the National Highway System for a term that is not shorter than the useful life of such facilities. (d) National Highway System defined In this section, the term National Highway System means the Federal-aid highway system described in section 103(b) of title 23, United States Code.