Upon approval of the plans and specifications and the municipality or municipalities interested have raised or set aside their proportional share of the estimated cost, the commissioner of transportation shall proceed with the construction of the bridge.
RSA 234:15
1945, 188:1, part 14:14. 1950, 5:1, part 9:1, par. 2. RSA 242:14. 1977, 79:5. 1981, 87:1. 1985, 402:6, I(b)(5).