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.
Read more about this topic: Federal Bridge Gross Weight Formula
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