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). Work zones do not double your fine here, but with workers present, driving outside the designated lane or ignoring the zone's traffic control devices is endangerment of a highway worker, $500 to $1,000 before anyone is even hurt (§ 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). Work zones do not double your fine here, but with workers present, driving outside the designated lane or ignoring the zone's traffic control devices is endangerment of a highway worker, $500 to $1,000 before anyone is even hurt (§ 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. South Carolina does not double your fine in a work zone. With workers present, driving in a lane not clearly designated for travel through the zone, or failing to obey the zone's traffic control devices, is a separate offense called endangerment of a highway worker, and it runs $500 to $1,000 with no injury, $1,000 to $2,000 if someone is physically injured, and $2,000 to $5,000 for great bodily injury, plus two points on your record and four if there was an injury (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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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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