7. a. Nothing in this act shall be construed as expanding or diminishing the authority of the commissioner to regulate traffic and parking on public highways or transportation systems under the jurisdiction of the commissioner and to establish, operate, control and maintain official traffic control devices thereon.
b. Nothing in this act shall be construed as superseding any provision or expending or diminishing the authority of the commissioner in regard to the "State Highway Access Management Act," P.L.1989, c.32 (C.27:7-89 et al.).