In order to observe or fulfill any obligation of the state created by or pursuant to part IV of chapter 234 of the 1958 revision of the general statutes, as amended, prior to June 13, 1961, or to permit certain vehicular passage between the Governor John Davis Lodge Turnpike and the project without violation of any such obligation, the commissioner is specifically empowered at any time to prohibit or otherwise restrict, or on behalf of the state to agree to prohibit or otherwise restrict, the passage of all or any motor vehicles to said project from Connecticut Route 32 or any route generally parallel thereto west of the Thames River and east of the Governor John Davis Lodge Turnpike or from the project to any such route.