1. The Director may grant to any person owning, operating or intending to construct a monorail or other overhead or underground system used for transportation easements for:
(a) The installation of supporting or accessory structures within the limits of a highway.
(b) The use of air space over or underground space beneath a highway.
2. The Director may authorize necessary construction work to be performed within the limits of the highway for the installation or repair of any such system, and the temporary closing of a highway, or the restriction of its use, for such purposes.
3. No structure may be installed or use made of overhead or underground space pursuant to this section which would permanently interfere with the existing use of any highway.