Trailer Breakaway Requirements by State
A breakaway system is the trailer's last line of defence: if the trailer separates from the tow vehicle, a cable pulls a switch that applies the trailer's own brakes from its own battery. Requirements are set at state level and usually attach to the same weight threshold as the brake rule.
Written by Imtinan Farooq, Editor, TowCapacityCalc · Updated
Quick answer
34 of the 50 states in this dataset have a verified breakaway requirement, almost always tied to the same weight at which trailer brakes become mandatory. Several states also specify how long the brakes must stay applied — 15 minutes is a common figure. States shown as needing verification are ones where a source has not yet been confirmed, not states that are known to have no rule.
Pre-trip breakaway test, step by step
Five minutes in the driveway, with the trailer coupled, chocked, and the tow vehicle's engine off.
| Line item | Weight | Where the number comes from |
|---|---|---|
| 1. Chock the trailer wheels | Both sides | The brakes are about to lock; the trailer must not move |
| 2. Check battery voltage | 12.6 V or better | Under about 12.0 V the brakes may not hold for the required time |
| 3. Pull the breakaway pin | Firm, straight pull | Do not tug the cable at an angle |
| 4. Try to move the trailer | Should not roll | Brakes are applied by the trailer battery alone |
| 5. Reinsert the pin | Fully seated | Confirm the brakes release |
| 6. Check cable length | Shorter than chains | Long enough for full turns, short enough to pull on separation |
A breakaway system that has never been tested is an assumption, not a safety device. The battery is the component most likely to have quietly failed since last season.
What the system actually does
A steel cable runs from the trailer's breakaway switch to a fixed point on the tow vehicle — the hitch or a frame loop, never the safety chains and never the ball. If the coupler releases, the cable pulls a pin from the switch, which closes a circuit between the trailer battery and the trailer's electric brakes, locking them on.
The battery is the part that fails
The breakaway battery is small, sits outside in the weather, and is often only charged when the trailer is plugged into the tow vehicle. A dead battery makes the whole system inert while looking perfectly normal from the outside. Test it before a trip by pulling the pin with the trailer wheels chocked and confirming the brakes lock, then reinsert the pin.
Routing mistakes that defeat it
Attaching the cable to the safety chains means a separation drags the chains and the cable together, and the pin may never pull. Leaving the cable too long has the same effect. Leaving it too short pulls the pin on a tight turn and locks the trailer brakes mid-manoeuvre. It should be shorter than the chains and longer than the coupler's travel.
Breakaway usually follows the brake threshold
In most states the breakaway rule is written into the same statute as the brake rule, so if your trailer needs brakes it also needs a breakaway system. Check both on the state page before assuming one without the other.
Breakaway requirement by state
| State | Breakaway requirement | Brake threshold | Rule detail |
|---|---|---|---|
| Alabama | No statewide requirement found | 3,000 lb | Ala. Code 32-5-212 |
| Alaska | Yes | 5,000 lb | 13 AAC 04.205(d)(2) |
| Arizona | Yes | 3,000 lb | A.R.S. 28-952(A)(3) |
| Arkansas | Yes | 3,000 lb | Ark. Code 27-37-501(c) |
| California | Yes | 1,500 lb | Cal. Veh. Code 26304 |
| Colorado | Yes | 3,000 lb | C.R.S. 42-4-223(1)(c) |
| Connecticut | Yes | 3,000 lb | R.C.S.A. 14-137-123, 14-137-124, as stated by Connecticut DMV |
| Delaware | No statewide requirement found | 4,000 lb | 21 Del. C. 4305 |
| Florida | Yes | 3,000 lb | Fla. Stat. 316.261(4) |
| Georgia | Yes | 3,000 lb | 49 C.F.R. 393.43 as applied by Georgia DPS Fact Sheet 054; trailer brakes over 3,000 lb per O.C.G.A. 40-8-50(d) |
| Hawaii | Yes | 3,000 lb | Haw. Admin. R. 19-133.2-40(b)(8) |
| Idaho | Yes | 1,500 lb | Idaho Code 49-933(3) |
| Illinois | Yes | 3,000 lb | 625 ILCS 5/12-301(a)(4) |
| Indiana | Yes | 3,000 lb | Ind. Code 9-19-3-3 |
| Iowa | No statewide requirement found | 3,000 lb | Iowa Code 321.430(3) |
| Kansas | No statewide requirement found | See state page | K.S.A. 8-1734; 8-1907(d) |
| Kentucky | No statewide requirement found | See state page | KRS 189.090 |
| Louisiana | Yes | 3,000 lb | La. R.S. 32:341(C) |
| Maine | No statewide requirement found | 3,000 lb | 29-A M.R.S. 1902(4) |
| Maryland | Yes | 3,001 lb | Md. Code, Transp. 22-301(e) |
| Massachusetts | Needs verification | 10,000 lb | — |
| Michigan | No statewide requirement found | 3,000 lb | Mich. Comp. Laws 257.705(1)(c) |
| Minnesota | Yes | 3,000 lb | Minn. Stat. 169.67, subd. 3(b) |
| Mississippi | Yes | 2,000 lb | Miss. Code Ann. 63-7-51(3) (text via Mississippi Legislature bill document) |
| Missouri | Yes | See state page | Rule text on state page |
| Montana | Yes | 3,000 lb | Mont. Code Ann. 61-9-305 |
| Nebraska | Yes | 3,000 lb | Neb. Rev. Stat. 60-6,246(2) |
| Nevada | Yes | 1,500 lb | Nev. Rev. Stat. 484D.250(5) |
| New Hampshire | Needs verification | 3,000 lb | — |
| New Jersey | Yes | 3,000 lb | Rule text on state page |
| New Mexico | No statewide requirement found | 3,000 lb | NMSA 1978 66-3-840(A)(3)-(4) |
| New York | Yes | 3,000 lb | NY DMV MV-529C; brake threshold at NY VTL 375(1)(c) |
| North Carolina | No statewide requirement found | 4,000 lb | N.C.G.S. 20-124(f) |
| North Dakota | No statewide requirement found | See state page | N.D.C.C. 39-21-32(3) |
| Ohio | Yes | See state page | Ohio Rev. Code 4513.20(A)(4) |
| Oklahoma | Yes | 3,000 lb | 47 O.S. 12-301(C) |
| Oregon | No statewide requirement found | See state page | ODOT Towing a Trailer in Oregon (737-3503) p.15; ORS 815.125(3) |
| Pennsylvania | Yes | 3,000 lb | 75 Pa.C.S. 4502(c) |
| Rhode Island | Yes | 4,000 lb | R.I. Gen. Laws 31-23-4(c) |
| South Carolina | Yes | 3,000 lb | S.C. Code 56-5-4850(d), (e) |
| South Dakota | Yes | 3,000 lb | SDCL 32-18-17 |
| Tennessee | Yes | 3,000 lb | Tenn. Code Ann. 55-9-204, per Tennessee Highway Patrol trailer inspection requirements |
| Texas | Yes | 4,500 lb | Tex. Transp. Code 547.405(d), (e) |
| Utah | Needs verification | See state page | Rule text on state page |
| Vermont | Yes | 3,000 lb | 23 V.S.A. 1307(f), (g) |
| Virginia | Yes | 3,000 lb | 19VAC30-70-100 (authority Va. Code 46.2-1165) |
| Washington | Yes | 3,000 lb | RCW 46.37.340(4) |
| West Virginia | Yes | 3,000 lb | W. Va. Code 17C-15-31(a)(3) |
| Wisconsin | No statewide requirement found | 3,000 lb | Wis. Stat. 347.35(3); Wis. Admin. Code Trans 308.01, 305.51 |
| Wyoming | Needs verification | See state page | — |
"Not verified as required" means no requirement was confirmed in the sources reviewed for that state — treat it as unverified rather than as an exemption.
Frequently asked questions
What is a trailer breakaway system?
A cable-operated switch that applies the trailer's electric brakes from the trailer's own battery if the trailer separates from the tow vehicle.
Do I need a breakaway system on a small trailer?
Generally only if the trailer needs brakes at all, since most states tie the two rules to the same weight threshold. Check your state's page for the exact wording.
Where should the breakaway cable attach?
To the hitch or a dedicated frame loop on the tow vehicle — never to the safety chains, and never to the ball or ball mount that could leave with the trailer.
How long do the brakes have to stay applied?
Where a duration is specified, 15 minutes is the common figure. A healthy, charged breakaway battery is what makes that possible.
Before you trust any number here
Every figure on this page is a planning estimate. The binding limits are printed on your vehicle: the driver-door payload sticker, the certification label, the hitch label, the tire sidewalls, and the trailer data plate. Weigh the loaded rig before a long trip.
Read the full verification checklistExplore this topic cluster
Brake thresholds, breakaway systems, safety chains, brake gain, and how requirements change as you cross state lines.