North Carolina Semitrailer Length Limit

North Carolina sits at the 48-foot federal floor in Appendix B. No grandfathered length above it — what you can actually run comes from North Carolina state law, which like most states is 53 feet.

Appendix B length48'0"

Federal floor48'0" (all states)

Kingpin conditionNone

Tractor + 2 unitsNot allowed

Tractor + 3 unitsNot allowed

This is a floor, not your length limit. Appendix B lists what a state was grandfathered to keep under the STAA of 1982 and must go on allowing on the National Network. It is not the state's own limit, and it is not permission to run that length on any road you like. Most states allow 53-foot semitrailers under their own law — that permission comes from state statute, not from this table — and every state can still restrict length on specific routes, in cities, and off the National Network. Use this to know the federal baseline, then check the state limit and the route.

01 The rule

What North Carolina has to allow

Nothing was grandfathered above the floor here, and that is not the same as a 48-foot limit. It means the federal table protects nothing beyond 48 feet in North Carolina; whatever North Carolina allows above it — 53 feet in most states — comes from North Carolina's own statute and can be changed by North Carolina.

The number comes from 23 CFR Part 658 Appendix B, the STAA grandfather list. It binds North Carolina on the National Network and cannot be lowered. It says nothing about what North Carolina allows beyond it, which is where state law takes over.

02 The details

Length, kingpin and combinations

Appendix B semitrailer length: 48'0" (the federal floor)
Kingpin-to-rear-axle condition: None in Appendix B for this state.
Tractor plus two trailing units: not allowed
Tractor plus three trailing units: not allowed
Other grandfathered combinations: not allowed
Past the legal length: a North Carolina oversize permit — see North Carolina oversize permits.

North Carolina Trailer Length FAQ

What is the legal trailer length in North Carolina without a permit?

The federally protected length on the National Network is 48'0" (23 CFR 658 Appendix B). That is the 48-foot floor every state must allow. North Carolina state law sets what you can actually run, and for most states that is 53 feet.

Can I run a 53-foot trailer in North Carolina?

Appendix B only protects 48'0" in North Carolina. 53-foot trailers are common there under North Carolina state law, but that permission is state statute, not this federal table — confirm the current North Carolina limit and any route restriction.

Are doubles or triples allowed in North Carolina?

North Carolina has no grandfathered LCV rights in Appendix C. Standard STAA doubles only — no long doubles, no triples.

Does this length apply on every road in North Carolina?

No. Appendix B binds the National Network — the Interstates plus the designated primary routes. Off the network, and inside cities, North Carolina can and does restrict length, and posted route restrictions still apply. Check the route as well as the number.

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: eCFR, 23 CFR 658 Appendix B and C (title 23 as of 2026-07-23). See our Terms & Disclaimer.

03 Related

Check North Carolina before you roll

Live weather, closures, and hazards on one map. Free, no account.

Open Live Map →

North Carolina Semitrailer Length Limit

What North Carolina has to allow

Length, kingpin and combinations

North Carolina Trailer Length FAQ

More for North Carolina

North Carolina Weight Limits

North Carolina Oversize Permits

North Carolina 511

All States

Check North Carolina before you roll