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Trailer Length No. CA 53 ft on a kingpin limit

California Semitrailer Length Limit

California is listed at 48'0" in Appendix B, and a 53-foot semitrailer runs without a permit as long as the kingpin-to-rearmost-axle distance stays at 38 ft or less.

Appendix B length48'0"
Federal floor48'0" (all states)
Kingpin condition38 ft
Tractor + 2 unitsNot allowed
Tractor + 3 unitsNot allowed
The kingpin rule is the real limit here. Semitrailers up to 53 feet may also operate without a permit by conforming to a kingpin-to-rearmost axle distance of 38 feet. Semitrailers that are consistent with 23 CFR 658.13(g) may operate without a permit provided the distance from the kingpin to the center of the rear axle is 46 feet or less.
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 California has to allow

The footnote is the operative rule in California, not the table entry. A 53-foot semitrailer needs its kingpin within 38 ft of the rearmost axle, or 46 feet to the centre of the rear axle for a trailer consistent with 23 CFR 658.13(g). Measure the setting, not the trailer.

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

02 The details

Length, kingpin and combinations

California Trailer Length FAQ

What is the legal trailer length in California without a permit?
Appendix B lists California at 48'0", but that is not the practical answer. A 53-foot semitrailer is legal without a permit if the kingpin-to-rearmost-axle distance is 38 ft or less, or 46 feet to the centre of the rear axle for a trailer consistent with 23 CFR 658.13(g).
Can I run a 53-foot trailer in California?
Yes, without a permit, provided the kingpin-to-rearmost-axle distance meets the 38 ft limit in the Appendix B footnote. Miss it and a standard 53-foot van is illegal in California, not merely long. Measure the setting before you plan the run.
Are doubles or triples allowed in California?
California 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 California?
No. Appendix B binds the National Network — the Interstates plus the designated primary routes. Off the network, and inside cities, California 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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