LEGAL LIMITATIONS
WEIGHT
MAXIMUM LEGAL WEIGHT ALLOWED
The maximum gross and axle weight limitations are as follows and may not be operated in excess of:
Wheel, Axle, Gross | Weight Limitation |
Single Wheel | 10,500 Pounds |
Single Axle | 20,000 Pounds |
Tandem Axle | 34,000 Pounds |
Tridem Axle | Must comply with bridge formula |
Gross Vehicle Weight | 80,000 Pounds |
An overweight permit must be obtained to authorize any exception to the maximum weight limitations listed above.
A highway authority may prohibit the operation of any vehicle or impose restrictions on the weight of a vehicle upon any highway under its jurisdiction.
Exception: Passenger buses may carry 24,000 lbs. on each axle provided they do not exceed manufacturer tire load ratings. This section exempts them from the 34,000 lb. tandem and bridge limitations.
Title 23: 658.17(k) Any over the road bus, or any vehicle which is regularly and exclusively used as an intrastate public agency transit passenger bus, is excluded from the axle weight limits in paragraphs (c) through (e) of this section until Oct. 1, 2009. Any State that has enforced, in the period beginning Oct. 6, 1992, and ending Nov. 30, 2005, a single axle weight limitation of 20,000 pounds or greater but less than 24,000 pounds may not enforce a single axle weight limit on these vehicles of less than 24,000 pounds.
Federal Bridge Formula
The formula limits the weight on groups of axles in order to reduce the risk of damage to highway bridges. Allowable weight depends on the number of axles a vehicle has and the distance between those axles. However, the single-or-tandem-axle weight limits supersede the Bridge Formula limits for all axles not more than 96 inches apart.
Until 1982, Federal law set only upper limits (or ceilings) on Interstate System weight limits. A few states retained significantly lower weight limits, which eventually became barriers to long-distance truck traffic. In 1982, Federal law was amended to make Interstate Systems weights limits, including the bridge formula limits, both the maximum and the minimum weights (i.e., floors and ceilings) that states must allow on the Interstate System.
To use the formula, {W=500[(LN/N-1) + 12N + 36]}, you take the number of axles and plug them in for N and the distance measured rounded to the next foot for L.
W = the maximum weight in pounds that can be carried on a group of two or more axles to the nearest 500 pounds.
L = the distance in feet between the outer axles of any two or more consecutive axles.
N = the number of axles being considered.
The calculation would then go in the following order:
Now we multiply 141 by 500 and this gives us: W = 70,500 lbs
MAXIMUM PERMIT WEIGHT ALLOWED
SINGLE, SEMI ANNUAL, ANNUAL TRIP PERMITS FOR OVERWEIGHT NON-DIVISIBLE LOADS
Vehicles with a gross vehicle weight of less than 125,000 may be permitted on a single trip, semiannual, or annual basis as described below:
Single Axle | 29,500 lbs |
Tandem Axle | 50,000 lbs |
Tridem Axle | 61,750 lbs |
Trunnion Axle | 60,000 lbs |
Gross Weight | 125,000 lbs |
The above weights are for general reference. Actual weight must comply with Bridge Table allowances.
OVERWEIGHT NON-DIVISIBLE LOADS EXCEEDING 125,000 LBS
Loads exceeding 125,000 pounds gross, or axle weights in R909-2-24, may only purchase single trip permits.
Axle, bridge, and gross weight allowances will be determined based on the non-divisible bridge table formula ~1.47 x 500 (LN/N-1 + 12N + 36) or in accordance with the bridge table.
9 feet wide axles are allowed 7.5% more weight.
10 feet wide axles are allowed 15% more weight than 8 feet wide axles.
When using an axle equipped with eight tires, rather than four, add 10% to the weight authorized for an 8 foot wide axle group.
All tires shall be in compliance with the manufacturers tire load rating as indicated on the tire side wall.
All STE operations must have an STE profile sheet when the axle limitations specified in Table 3 or bridge table are exceeded.
OVERWEIGHT DIVISIBLE LOADS
GROSS VEHICLE WEIGHT IS 129,000 pounds maximum for obtaining a permit.
An overweight divisible load permit may be issued for moving a combination of vehicles and loads exceeding the legal limits under the following conditions:
An overweight divisible load permit may be issued for moving a combination of vehicles and loads exceeding the legal limits under the following conditions:
Overweight divisible load options are:
The combination unit will conform to the bridge formula and the legal axle and gross vehicle weight limits.
A divisible load permit may not be used to transport a non-divisible load.
Source of information: https://www.udot.utah.gov/main/f?p=100:80:0:::1:T,V:4205
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