Highways of the state shall be divided into 7 classes as follows:
RSA 229:5
1925, 110:1. PL 83 :22. RL 99:24. 1943, 123:1. 1945, 188:1, part 1:4. 1951, 30:1. RSA 230:4 . 1955, 333:2. 1957, 181:1, 2, 3. 1961, 4:2. 1973, 418:1-3. 1975, 249:1-3. 1979, 216:1. 1981, 87:1; 443:1. 1983, 131:1. 1985, 235:1-4; 402:6, I(b)(1). 1992, 265:8-10. 1995, 77:1. 1999, 109:1. 2000, 24:1, eff. May 28, 2000. 2018, 327 : 1 , eff. Aug. 24, 2018.