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Trailer Length No. RI Grandfathered longer

Rhode Island Semitrailer Length Limit

Rhode Island is grandfathered at 48'6". Every state must allow 48 feet on the National Network; Rhode Island kept the right to allow 48'6" and cannot drop below it.

Appendix B length48'6"
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 Rhode Island has to allow

Rhode Island kept 48'6" under the STAA grandfather, so anything up to that length is federally protected on the National Network and Rhode Island cannot legislate below it. A standard 53-foot van is longer than that, so it runs on Rhode Island state law rather than on this federal protection.

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

02 The details

Length, kingpin and combinations

Rhode Island Trailer Length FAQ

What is the legal trailer length in Rhode Island without a permit?
The federally protected length on the National Network is 48'6" (23 CFR 658 Appendix B). Rhode Island was grandfathered above the 48-foot floor and must keep allowing it.
Can I run a 53-foot trailer in Rhode Island?
Appendix B only protects 48'6" in Rhode Island. 53-foot trailers are common there under Rhode Island state law, but that permission is state statute, not this federal table — confirm the current Rhode Island limit and any route restriction.
Are doubles or triples allowed in Rhode Island?
Rhode Island 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 Rhode Island?
No. Appendix B binds the National Network — the Interstates plus the designated primary routes. Off the network, and inside cities, Rhode Island 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.

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