Federal Bridge Gross Weight Formula - Bridge Formula Table

Bridge Formula Table

Distance in feet between any
group of two or more axles 1		 Gross weight in pounds 2
2 axles 3 axles 4 axles 5 axles 6 axles 7 axles
Less than 8 3 34,000 34,000
More than 8 4 38,000 42,000
9 39,000 42,500
10 40,0005 43,500
11 40,000 44,000
12 40,000 45,000 50,000
13 40,000 45,000 50,500
14 40,000 46,500 51,500
15 40,000 47,000 52,000
16 40,000 48,000 52,500 58,000
17 40,000 48,500 53,500 58,500
18 40,000 49,500 54,000 59,000
19 40,000 50,500 54,500 60,000
20 40,000 51,000 55,500 60,500 66,000
21 40,000 51,500 56,000 61,000 66,500
22 40,000 52,500 56,500 61,500 67,000
23 40,000 53,000 57,500 62,500 68,000
24 40,000 54,000 58,000 63,000 68,500 74,000
25 40,000 54,500 58,500 63,500 69,000 74,500
26 40,000 55,500 59,500 64,000 69,500 75,000
27 40,000 56,000 60,000 65,000 70,000 75,500
28 40,000 57,000 60,500 65,500 71,000 76,500
29 40,000 57,500 61,500 66,000 71,500 77,000
30 40,000 58,500 62,000 66,500 72,000 77,500
31 40,000 59,000 62,500 67,500 72,500 78,000
32 40,000 60,0005 63,500 68,000 73,000 78,500
33 40,000 60,000 64,000 68,500 74,000 79,000
34 40,000 60,000 64,500 69,000 74,500 80,0005
35 40,000 60,000 65,500 70,000 75,000 80,000
36 40,000 60,000 66,0006 70,500 75,500 80,000
37 40,000 60,000 66,5006 71,000 76,000 80,000
38 40,000 60,000 67,5006 71,500 77,000 80,000
39 40,000 60,000 68,000 72,500 77,500 80,000
40 40,000 60,000 68,500 73,000 78,000 80,000
41 40,000 60,000 69,500 73,500 78,500 80,000
42 40,000 60,000 70,000 74,000 79,000 80,000
43 40,000 60,000 70,500 75,000 80,0005 80,000
44 40,000 60,000 71,500 75,500 80,000 80,000
45 40,000 60,000 72,000 76,000 80,000 80,000
46 40,000 60,000 72,500 76,500 80,000 80,000
47 40,000 60,000 73,500 77,500 80,000 80,000
48 40,000 60,000 74,000 78,000 80,000 80,000
49 40,000 60,000 74,500 78,500 80,000 80,000
50 40,000 60,000 75,500 79,000 80,000 80,000
51 40,000 60,000 76,000 80,0005 80,000 80,000
52 40,000 60,000 76,500 80,000 80,000 80,000
53 40,000 60,000 77,500 80,000 80,000 80,000
54 40,000 60,000 78,000 80,000 80,000 80,000
55 40,000 60,000 78,500 80,000 80,000 80,000
56 40,000 60,000 79,500 80,000 80,000 80,000
57 40,000 60,000 80,0005 80,000 80,000 80,000
  • 1 Calculated values reflect FHWA policy of rounding down when distances fall exactly between 6-inch (15 cm) increments.
  • 2 Calculated values reflect FHWA policy of rounding down when weights fall exactly between 500 pound increments.
  • 3 Tandem axle by definition.
  • 4 Distances between 8 feet (2.4 m) to 8 feet 11 inches (2.72 m) may not be rounded down.
  • 5 __ Maximum legal weight limit based on number of axles. Increased axle lengths beyond these do not increase maximum legal weight.
  • 6 __ Exception to the formula: when the four axles under consideration are two tandem axles spaced at least 36 feet (11 m) apart, a gross weight of 68,000 pounds (31,000 kg) is allowed.
  • __ Upper blank areas represent unrealistic configurations.

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