South Carolina Truck Speed Limit
South Carolina posts 70 on the interstate system and freeways, and trucks run the same limit (S.C. Code Ann. § 56-5-1520). No split. Multilane divided primary highways drop to 60, and ordinary roads to 55. Slower traffic keeps right (§ 56-5-1560). Speeding in a marked work zone with workers present doubles your fine (§ 56-5-1535). Hauling a manufactured or mobile home? You're capped at 10 under the posted limit and never over 55.
How fast a truck can run in South Carolina
South Carolina posts 70 on the interstate system and freeways, and trucks run the same limit (S.C. Code Ann. § 56-5-1520). No split. Multilane divided primary highways drop to 60, and ordinary roads to 55. Slower traffic keeps right (§ 56-5-1560). Speeding in a marked work zone with workers present doubles your fine (§ 56-5-1535). Hauling a manufactured or mobile home? You're capped at 10 under the posted limit and never over 55.
Truck-specific rules and quirks
- Slower traffic keeps to the right-hand lane (S.C. Code Ann. § 56-5-1560).
- Hauling a manufactured, modular, or mobile home caps you at 10 mph under the posted limit and never over 55 (S.C. Code Ann. § 56-5-1520).
What a speeding ticket costs
Speeding fines are graduated and set by the court. In a marked work zone with workers present, the fine is doubled (S.C. Code Ann. § 56-5-1535).
South Carolina Truck Speed Limit FAQ
What is the truck speed limit in South Carolina?
Do trucks have a lower speed limit than cars in South Carolina?
What is the speeding penalty for a truck in South Carolina?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.scstatehouse.gov/code/t56c005.php. See our Terms & Disclaimer.
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