The project and all approach or connecting highways incidental thereto shall be maintained by the commissioner and be part of the state highway system.
Conn. Gen. Stat. § 13a-34
(1961, P.A. 541, S. 12; 1963, P.A. 226, S. 35; P.A. 73-675, S. 9, 44; P.A. 75-568, S. 6, 45.)