MAXIMUM LEGAL WEIGHT ALLOWED
National weight standards apply to commercial vehicle operations on the Interstate Highway System, an approximately 40,000-mile system of limited access, divided highways that spans the nation. Off the Interstate Highway System, states may set their own commercial vehicle weight standards.
Federal commercial vehicle maximum standards on the Interstate Highway System are:
Gross Vehicle Weight:
Bridge Formula Weights
The bridge formula was introduced in 1975 to reduce the risk of damage to highway bridges by requiring more axles, or a longer wheelbase, to compensate for increased vehicle weight. The formula may require a lower gross vehicle weight, depending on the number and spacing of the axles in the combination vehicle.
MAXIMUM PERMIT WEIGHT ALLOWED
Two axle single unit vehicle 40,000 pounds
Three axle single unit vehicle 50,000 pounds
Four or more axle single unit vehicle 65,000 pounds
Combination of vehicles with three axles 55,000 pounds
Combination of vehicles with four axles 70,000 pounds
Combination of vehicles with five axles 90,000 pounds
Combination of vehicles with six axles 110,000 pounds
Combination of vehicles with seven axles 130,000 pounds
GROSS TANDEM WEIGHTS
Single axle 20,000 pounds
Tandem axle 40,000 pounds
Tridem or Quad axle 60,000 pounds
**A Quad axle greater than 60,000 lbs. has to be reviewed by engineering on the requested route of travel**
Multiple Trip Permit: A truck-specific, multiple trip permit shall be issued for the movement of a non-divisible load, mobile home or containerized cargo. The default allowances are as follows:
1) Non-divisible loads: up to 14 wide, 13’6 high and 90,000 lbs gross weight on 5 or more axles (not to exceed 40,000 lbs. per tandem).
2) Mobile Homes: up to 14 wide, 13’6 high and legal weight.
3) Containerized Cargo: up to 8’6 wide, 13’6 high and 90,000 on 5 or more axles (not to exceed 40,000 lbs. per tandem).
Any non-divisible load exceeding 130,000 pounds and/or any single axle weight that exceeds 20,000 lbs. will require additional routing analysis. This process may take up to 5 business days.
Source of information: https://www.scdot.org/business/permits-osow.aspx
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