Weight on Interstate and Defense Highway System.

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Table I.
Distance Between Extreme Axles in Feet Maximum Gross Weight in Pounds
2554,500
2655,500
2756,000
2857,000
2957,500
3058,500
3159,000
3260,000


Table II.
Distance Between Extreme Axles in Feet Maximum Gross Weight in Pounds
2860,500
2961,500
3062,000
3162,500
3263,500
3364,000
3464,500
3565,500
3666,000
3766,500
3867,500
3968,000




W = 500

{

LN
——
N − 1

+ 12N + 36

}



W = 500

{

LN
——
N − 1

+ 12N + 36

}


Table III.
Distance* 2 axles 3 axles 4 axles 5 axles 6 axles 7 axles
4 34,000
5 34,000
6 34,000
7 34,000
8 and less 34,000 34,000
more than 8 38,000 42,000
9 39,000 42,500
10 40,000 43,500
11 44,000
12 45,000 50,000
13 45,500 50,500
14 46,500 51,500
15 47,000 52,000
16 48,000 52,500 58,000
17 48,500 53,500 58,500
18 49,500 54,000 59,000
19 50,000 54,500 60,000
20 51,000 55,500 60,500 66,000
21 51,500 56,000 61,000 66,500
22 52,500 56,500 61,500 67,000
23 53,000 57,500 62,500 68,000
24 54,000 58,000 63,000 68,500 74,000
25 54,500 58,500 63,500 69,000 74,500
26 55,500 59,500 64,000 69,500 75,000
27 56,000 60,000 65,000 70,000 75,500
28 57,000 60,500 65,500 71,000 76,500
29 57,500 61,500 66,000 71,500 77,000
30 58,500 62,000 66,500 72,000 77,500
31 59,000 62,500 67,500 72,500 78,000
32 60,000 63,500 68,000 73,000 78,500
33 64,000 68,500 74,000 79,000
34 64,500 69,000 74,500 80,000
35 65,500 70,000 75,000
**36 66,000 70,500 75,500
**37 66,500 71,000 76,000
**38 67,500 71,500 77,000
39 68,000 72,500 77,500
40 68,500 73,000 78,000
41 69,500 73,500 78,500
42 70,000 74,000 79,000
43 70,500 75,000 80,000
44 71,500 75,500
45 72,000 76,000
46 72,500 76,500
47 73,500 77,500
48 74,000 78,000
49 74,500 78,500
50 75,500 79,000
51 76,000 80,000
52 76,500
53 77,500
54 78,000
55 78,500
56 79,500
57 80,000

*
**






Source. 1921, 119:25. PL 103:22. 1927, 77:1. 1929, 33:1. 1933, 157:1. 1935, 133:1. 1937, 82:1. 1939, 131:1. 1941, 169:1. RL 119:37. 1947, 11:1. 1949, 104:1. 1950, 11:1, 2. 1951, 20:11. RSA 263:61. 1955, 230:1; 310:2. 1963, 189:1, 3; 202:1. 1973, 468:2. 1977, 487:1, 2. 1979, 219:1; 220:2; 239:1; 358:12. 1981, 55:1; 146:1. 1983, 434:15. 1986, 121:2. 1987, 404:20. 2005, 203:9, eff. July 1, 2005. 2018, 74:2, eff. July 24, 2018.


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