At-a-glance summary
| Field | Value | Source | Status | Confidence |
|---|---|---|---|---|
| Gross | Federal Interstate gross limit is 80,000 lb; South Carolina-specific limits are in the FHWA state law compilation linked here. | inferred from official source | medium | |
| Single axle | Federal Interstate single-axle limit is 20,000 lb; South Carolina-specific limits are in the FHWA state law compilation linked here. | inferred from official source | medium | |
| Tandem axle | Federal Interstate tandem limit is 34,000 lb; South Carolina-specific limits are in the FHWA state law compilation linked here. | inferred from official source | medium | |
| Bridge formula | Federal bridge formula checks apply on Interstate routes; verify state exceptions and permit conditions before movement. | inferred from official source | medium | |
| Permit agency | South Carolina Department of Transportation | confirmed | high | |
| Seasonal / frost | No official statewide seasonal or frost weight restriction was confirmed during this review. | not found in official review | low | |
| Fine source | South Carolina Code section 56-5-4160 and related Chapter 5 weight provisions are the official sources reviewed for penalty context. | confirmed | medium |
Field-level reference data
Regular weight limits
| Gross vehicle weight limit | Federal Interstate gross limit is 80,000 lb; South Carolina-specific limits are in the FHWA state law compilation linked here. | inferred from official source | medium | |
|---|---|---|---|---|
| Single axle limit | Federal Interstate single-axle limit is 20,000 lb; South Carolina-specific limits are in the FHWA state law compilation linked here. | inferred from official source | medium | |
| Tandem axle limit | Federal Interstate tandem limit is 34,000 lb; South Carolina-specific limits are in the FHWA state law compilation linked here. | inferred from official source | medium | |
| Bridge formula applies | Federal bridge formula checks apply on Interstate routes; verify state exceptions and permit conditions before movement. | inferred from official source | medium | |
| Interstate notes | Use FHWA Interstate limits together with the state source and any permit conditions. | inferred from official source | medium | |
| Non-Interstate notes | Use the reviewed state source and local postings for non-Interstate operation. | inferred from official source | medium |
Axle and loading notes
| Steer axle notes | Steer axle review should include axle law, tire/equipment ratings, registration, and route postings. | inferred from official source | medium | |
|---|---|---|---|---|
| Drive axle notes | Drive axle groups should be checked against tandem/group limits and permit terms. | inferred from official source | medium | |
| Trailer tandem notes | Trailer tandem position changes distribution and may affect spacing-sensitive checks; re-weigh after adjustment. | inferred from official source | medium | |
| Fifth wheel notes | Fifth-wheel movement redistributes weight but does not create permit authority. | inferred from official source | medium | |
| Bridge law notes | Check FHWA bridge formula and the state source when axle spacing is close to a limit. | inferred from official source | medium |
Oversize / overweight permits
| Permit agency | South Carolina Department of Transportation | confirmed | high | |
|---|---|---|---|---|
| Permit office name | SCDOT Oversize/Overweight Permits | confirmed | high | |
| Official permit URL | SCDOT oversize/overweight permit source. | confirmed | high | |
| Online permit portal | Use SCDOT Oversize/Overweight Permits official source for current online filing or portal links. | inferred from official source | medium | |
| Permit contact | Use contact information published by SCDOT Oversize/Overweight Permits. | inferred from official source | medium | |
| Permit notes | Permit terms, route conditions, dates, and vehicle configuration should be checked on the official permit source before travel. | inferred from official source | medium |
Seasonal and special restrictions
| Frost / seasonal restriction | No official statewide seasonal or frost weight restriction was confirmed during this review. | not found in official review | low | |
|---|---|---|---|---|
| Seasonal weight notes | Local route, bridge, or permit restrictions may still apply; no statewide seasonal weight restriction was confirmed in this review. | not found in official review | low | |
| Official seasonal URL | not found in official review | low |
Fines and enforcement
| Overweight fine structure | South Carolina Code section 56-5-4160 and related Chapter 5 weight provisions are the official sources reviewed for penalty context. | confirmed | medium | |
|---|---|---|---|---|
| Overweight ticket notes | Use the cited South Carolina Code section and any permit record before estimating a penalty. | inferred from official source | medium | |
| Enforcement agency | South Carolina State Transport Police | confirmed | medium | |
| Fine official URL | Official fine or penalty source linked in Sources. | confirmed | medium | |
| CSA / safety notes | CSA impact depends on inspection and reporting; use FMCSA SMS materials and the actual inspection record. | inferred from official source | medium |
Scale notes
| Public scale notes | A public scale ticket is a self-check record, not state permit authority. | inferred from official source | medium | |
|---|---|---|---|---|
| Weigh station / enforcement notes | South Carolina State Transport Police is the reviewed official enforcement source. | inferred from official source | medium | |
| CAT Scale disclaimer | CAT Scale tickets are private self-check records and do not replace official permits or enforcement decisions. | inferred from official source | medium | |
| Scale ticket notes | Use steer, drive, trailer, and gross readings to compare against official limits before travel. | inferred from official source | medium |
South Carolina’s weight review has a specific fine reference in South Carolina Code section 56-5-4160 and related Chapter 5 weight provisions. The South Carolina State Transport Police handles enforcement. SCDOT handles the permit side. All three key fields are confirmed, making South Carolina’s sourcing picture cleaner than states where enforcement or fine fields remain open.
Reading the South Carolina weight table
Weight rows use the federal Interstate baseline and the FHWA state law compilation for South Carolina. I-85, I-77, and I-26 are major freight corridors through South Carolina, which serves as an important Southeast freight and port hub. Federal baseline applies on those routes. For US highways and state routes, verify the FHWA state law compilation and any permit conditions.
South Carolina’s port activity at Charleston creates significant freight volumes on port access roads. Those routes may have specific infrastructure conditions that affect what axle configurations are practical.
Permit and route authority in South Carolina
SCDOT Oversize/Overweight Permits is the permit authority for South Carolina over-limit moves. Applications go through SCDOT’s current permit system. South Carolina permits cover route, dates, vehicle configuration, and axle weights. Changes to equipment or routing require permit review.
Seasonal, route, and local checks
No statewide frost-law or seasonal weight restriction was confirmed for South Carolina in this review. South Carolina’s climate in most areas doesn’t produce frost-law restrictions. Local bridge postings and construction zone conditions can affect specific routes. For port access and older rural road segments, checking current conditions is worth the additional step.
Tickets and enforcement notes
South Carolina State Transport Police is the confirmed enforcement agency. South Carolina Code section 56-5-4160 and related Chapter 5 weight provisions are the official sources reviewed for penalty context. For any citation, the specific SCSC section, excess weight, and court instructions are the controlling documents.
Source-strength notes for South Carolina
This page uses 7 source records and carries 3 high-confidence, 23 medium-confidence, and 3 low-confidence fields. Permit, enforcement, and fine statute fields are well-supported — each has direct official backing. No statewide seasonal source confirmed; those fields carry low confidence.
Building a South Carolina source file
A South Carolina dispatch file should include SCDOT permit documentation, current scale ticket, approved route, and the SCSC 56-5-4160 reference. For Southeast I-85 and I-26 corridor planning, the axle weight table, permit office list, seasonal restrictions, and overweight fines pages support multi-state planning.
How to Read a CAT Scale Ticket covers ticket reading. How to Slide Tandems covers distribution. Bridge Formula Explained covers bridge spacing.
FAQ
What is South Carolina Code section 56-5-4160?
SC Code 56-5-4160 and related Chapter 5 weight provisions are the official sources reviewed for overweight penalty context in South Carolina.
Which South Carolina agency handles commercial vehicle enforcement?
South Carolina State Transport Police handles roadside weight enforcement. SCDOT handles oversize and overweight permits.
Does South Carolina have statewide seasonal weight restrictions?
No statewide frost-law source was confirmed for South Carolina. Local bridge and construction zone conditions can affect specific routes on secondary roads.