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South Carolina Oversize / Overweight Regulations

What is considered as "Oversized Load" in South Carolina?

Dimensions: Width: 8' 6" Height: 13' 6" route survey Max Undivisible Load: 125' Maximum Length: 75' Overhang: Rear 15 (trailer less than 48'; 10' (on trailers up 53')

What is considered as "Overweight Load" in South Carolina?

Weights: Single Axle: 20,000 lb. Tandem axle: 40,000 lb. Tridem: 60,000 lb. Max Gross Weight: 80,000 lb.

South Carolina Oversize / Overweight Permits

South Carolina Permit Department Contact Information


Fax: 803-737-2199

8:00 AM - 4:30 PM Eastern

South Carolina Pilot Cars / Escorts

When escort vehicles are required:

Wide Loads

A load or mobile home 12-14 ft. wide:

One front escort

Rear escort may also be required

Wide Loads and Overlength Loads

A load or mobile home more than 14 ft. up to 16 ft. feet wide, or with an overall length of 125 ft. or an overhand exceeding 15 ft. :
            Front escort
            Rear escort

All loads more than 16 ft. wide:
           Require both civilian and police escorts in both front and back.
           Also require a route survey

For all loads 16 ft high or higher:

A front escort with a height pole
A route survey is also required.

South Carolina Axle Regulations

Maximum Legal Weight Allowed

Maximum standards on the Interstate Highway System:

Single Axle:                    20,000 lb.
Tandem Axle:                34,000 lb.
Gross Vehicle Weight:  80,000 lb.

Maximum Permit Weight Allowed

Gross Weights

  • Two axle single                                                40,000 lb.
  • Three axle single                                              50,000 lb.
  • Four or more axle single unit                         65,000 lb.
  • Combination of vehicles with three axles   55,000 lb.
  • Combination of vehicles with four axles     70,000 lb.
  • Combination of vehicles with five axles      90,000 lb.
  • Combination of vehicles with six axles       110,000 lb.
  • Combination of vehicles with seven axles  130,000 lb.

Gross Tandem Weights

  • Single axle                         20,000 lb.
  • Tandem axle                     40,000 lb.
  • Tridem or Quad axle        60,000 lb.

South Carolina Trip and Fuel (IRP / IFTA) Permits

Trip Permit

A Temporary Trip Permit is issued in lieu of IRP plates for travel within South Carolina.

The fee for a Temporary South Carolina Trip Permit is $15 and is valid for 72 hours.

Permits can be obtained through a permitting service, who will charge an additional processing fee.

Fuel Permit

A Temporary Fuel permit is issued in lieu of IFTA licensing for travel within South Carolina.

The fee for a Temporary South Carolina Fuel permit is $15 and is valid for 10 days.

Permits can be obtained from the Motor Carrier Services office, located at 10311 Wilson Blvd., Blythewood, South Carolina 29016 or through a permitting service, who will charge an additional processing fee.

South Carolina Overweight / Oversize Fines

A person who operates a vehicle on a public highway whose axle weight is in excess of the legal limits is guilty of a misdemeanor and, upon conviction, must be fined or imprisoned not more than thirty days, or both.

A person who operates a vehicle found to exceed the excess gross weight limitations shall pay to the Department of Public Safety a fine based on the following scale:

WEIGHT                       FINE

500 – 3,500 lb.            $.04 lb. overweight

3,501 – 6,000 lb.         $.06 lb. overweight

6,001 lb. and over      $.10 lb. overweight

Any person violating the provisions of this chapter is deemed guilty of a misdemeanor and upon conviction must be fined: (a) Not less than one hundred dollars for a first offense; (b) Not less than five hundred dollars for a second offense; (c) Not less than one thousand dollars for a third or subsequent offense.

Running Hours and Holiday Restrictions

The Department reserves the right to require escorts where it is deemed necessary for safety purposes. A vehicle transporting a load can not also serve as an escorting vehicle. 


For loads provide a rotating amber beacon or strobe light on the rear of the load or mobile home in excess of 12 feet wide up to and including 14 feet wide at a location readily visible to following traffic.

On any load over 14 ft., up to 16 ft. wide, a rotating amber beacon or strobe light is required on each outer rear corner of the load.

"Oversize" Signs

On all loads and mobile homes 12 ft. wide or wider the permittee shall provide signs on the front and rear of the load reading WIDE LOAD or OVERSIZE LOAD with letters 12 inches high and at least 1 1/2 inches wide. Letters: Black, 12 in. high, 1.5 in. brushstroke.

Flag Requirements

Any motor vehicle having a load or vehicle component which extends beyond the sides more than 4 inches or 4 feet or more beyond the rear shall have the extremities of the load marked with a red flag, not less than 12 inches square. On all loads and mobile homes 12 feet wide or wider red flags must be displayed at each outer four corners of the load. 

Flags, Lights and Banners

Up to 12 ft. wide: All loads up to 12 ft. wide allowed to travel 1/2 hour after sunrise to 1/2 hour before sunset Monday through Saturday.

All loads over 12 ft. wide up to 15 ft. wide traveling in proximity to large urban areas must pause 7am - 9am and 3pm - 6 pm on school days and 4:30-6pm one non-school days.

All loads over 15 ft. wide travel only Monday - Saturday between the hours of 9am and 3pm on school days, and until 4pm other days. 

Sunday and Holiday Travel Restrictions: NO travel shall be allowed on Sunday, New Year’s Day, Memorial Day, Fourth of July, Labor Day, Thanksgiving Day and Christmas Day OR from 12:00 noon the day before a holiday until 12:00 noon the day after each holiday (not including Sunday), except upon written approval from the Department. 

South Carolina Tire Regulations

Every motor vehicle, trailer or semitrailer operated upon the highways shall be equipped with tires of sufficient size and in sufficient number to distribute the wheel loads on the road surface so as to avoid damage to the highway, and all such tires shall be in a safe operating condition.

It is permissible to use tire chains of reasonable proportions upon any vehicle when required for safety, because of snow, ice or other conditions tending to cause a vehicle to skid.

It is also be permissible to use upon any vehicle for increased safety, regular and snow tires with studs which project beyond the tread of the traction surface of the tire not more than 1/16 of an inch when compressed.

South Carolina Annual Permits

The Department of Transportation may issue special permits authorizing the movement of vehicles or combinations of vehicles exceeding the State weight limits. Though all vehicles and loads are eligible for consideration, specific consideration is given to loads that cannot be disassembled readily. Multitrip permits may be issued by the Department of Transportation for overweight non-divisible loads.

Maximum Dimensions: 

Non-divisible loads: up to 14 ft. wide, 13 ft. 6 in. high and 90,000 lb. gross weight on 5 or more axles (not to exceed 40,000 lb. per tandem). 

Maximum Overall Vehicle Length Bumper to Bumper 40 ft.

Cost: $100

Time, it takes to receive: 1 business day

Mailing method: online

Commodity specific? Truck specific

Need to obtain a route? No

Multiple Trip Permits may travel all US, SC, and Interstate routes (unless posted for load) with the maximum dimensions defined above. Travel on secondary routes is prohibited; an additional route specific permit must be obtained from the permit office when traveling on secondary roads.

South Carolina Road Conditions

With specific reference to work zones, safety refers to minimizing potential hazards to road users in the vicinity of a work zone and highway workers at the work zone interface with traffic.

To stay safe and keep others safe on the roads as well follow these guidelines:

  • Stay alert
  • Reduce speed
  • Observe posted signs
  • Turn on headlights
  • Scan the road ahead to see how traffic is adjusting
  • Do not follow too closely behind cars
  • Put away all distractions
  • Use your turn signals
  • Watch for brake lights ahead
  • Be patient and avoid road rage

South Carolina Manufactured Houses and Mobile homes

Both single and multiple trip permits are available.

Maximum limits for mobile homes granted by permit:

up to 16’ wide, 15’ high.

Length: The maximum overall length shall be 100 feet (mobile home 80 feet or less)

A Multiple Trip Permit is valid for 1 year from the date of issuance. 

Multiple Trip Permits may travel all US, SC and Interstate routes (unless posted for load) with the maximum dimensions defined above. Travel on secondary routes is prohibited.

An additional route specific permit must be obtained from the permit office when traveling on secondary roads. 

Multiple Trip Permits for Non-Divisible loads and Mobile Homes can obtain a route specific permit for loads up to a maximum height of 15 feet and up to 130,000 lbs. gross weight.

Self-Issue Multiple Trip Permit: Multiple trip permits for Non-Divisible loads, Containerized Cargo and Mobile Homes can be self-issued 24 hours, 7 days a week with an OS/OW web account or by signing on as a guest user. The above default dimensions will automatically be issued on the permit.

Multiple pieces shall not be transported side by side or end to end, creating overhang on the rear or over the side of the vehicle or combination of vehicles

Permit Fees:

Single Trip Permit                              $30.00 

Excessive width over 16’                 $35.00 

Excessive width over 18’                 $40.00 

Excessive width over 20’                 $45.00 

Excessive width over 22’                 $50.00 

Multiple Trip Permit (Annual)         $100.00

Speed Limits for Mobile Homes: The maximum speed on the Interstate highways for a new mobile home shall be 10 MPH less than posted speed limit, not to exceed 55 MPH.

All other mobile homes shall not exceed 45 MPH.

The maximum speed on Non-Interstate highways for a new or used mobile home shall not exceed 45 MPH. 


Oversize / Overweight Regulations By State