The department of transportation shall assume full control and pay the costs of construction, reconstruction and maintenance of all highways within the state included in the national system of interstate highways.
Source. 1945, 188:1, part 2:2. 1950, 5:1, part 9:1, par. 3. RSA 231:2. 1981, 87:1. 1985, 402:6, I(a)(2).