Arkansas regulates vehicle horns with a statute that dates back to Act 300 of 1937 and has never been given a decibel number. If you run a train horn in the Natural State, the law that matters is Ark. Code Ann. § 27-37-202 — and one phrase in it: "reasonably necessary."
The short answer
Train horns are legal to own in Arkansas, and no state statute caps horn volume with a specific decibel figure. What the law controls is how and when you use a horn on a public road. Every motor vehicle on a highway must carry a horn audible from at least 200 feet, no horn may emit "an unreasonably loud or harsh sound or a whistle," and you may sound it only when "reasonably necessary to ensure safe operation."
In other words, the hardware is not the problem — the blast is. A 150 dB horn used as a genuine collision warning on a two-lane highway in the Delta is doing exactly what the statute says a horn is for. The same horn laid on for a laugh in a Little Rock parking lot is a ticket waiting to happen. That use-based model is the same pattern we map across the country in our train horn legality overview, and Arkansas sits firmly on the permissive side of it.
Ark. Code § 27-37-202: what the statute actually says
The horn rule lives in subsection (a) of Ark. Code Ann. § 27-37-202, reproduced in the state's official motor vehicle and traffic law book issued by the Arkansas Department of Transportation and the Department of Finance and Administration. It reads:
"(a)(1)(A) Every motor vehicle when operated upon a highway shall be equipped with a horn in good working order and capable of emitting sound audible under normal conditions from a distance of not less than two hundred feet (200′). (B) No horn or other warning device shall emit an unreasonably loud or harsh sound or a whistle. (2) When reasonably necessary to ensure safe operation, the driver of a motor vehicle shall give audible warning with his or her horn but shall not otherwise use the horn when upon a public street or highway."
Break that down and you get three rules:
- 200 feet is a floor, not a ceiling. Your horn must be audible from at least 200 feet under normal conditions. Any train horn clears that easily, and nothing in the statute sets a maximum.
- "Unreasonably loud or harsh" is the real limit, and it is undefined. Arkansas never says where loud becomes unreasonably loud. That judgment belongs to the officer at the roadside and, if you contest it, to a judge. Where, when, how long, and why you sounded the horn decide the outcome — not the dB rating on the box.
- "Reasonably necessary" limits use on public roads. The driver shall warn when it is reasonably necessary for safe operation and "shall not otherwise use the horn" on a public street or highway. Greeting honks, tailgate-party blasts, and drive-by pranks all fall outside that permission.
The language traces to Section 125 of Act 300 of 1937, with later amendments in 1959, 2003, and 2017. None of those amendments added a decibel cap. Arkansas simply never rebuilt this law around sound-level numbers.
Where "reasonably necessary" stops applying: private land
Both halves of the horn rule are tied to roads. Subsection (a)(1) applies to a vehicle "operated upon a highway," and the use restriction applies "upon a public street or highway." Under Ark. Code § 27-49-114, "street" or "highway" means "the entire width between boundary lines of a roadway publicly maintained when any part of the roadway is open to the use of the public for purposes of vehicular travel." The same section separately defines a "private road or driveway" as a way in private ownership used by the owner and people with the owner's permission.
That "publicly maintained" wording matters. Your farm lanes, a hunting lease in the Ozarks, a rice-field levee road, or your own gravel drive are not highways, so the "reasonably necessary" limit does not reach them. County roads, on the other hand, are publicly maintained, so the full statute applies on the rural road grid, not only on state routes.
One more wrinkle farm owners will appreciate: Ark. Code § 27-37-102 says the equipment provisions of Chapter 37 do not apply to implements of husbandry, road machinery, road rollers, or farm tractors, except where the chapter specifically makes them applicable. Private land does not escape city or county noise ordinances, though — more on that below.
Sirens, whistles, and bells are a different story
Subsection (b)(1) of § 27-37-202 is blunt: "No vehicle shall be equipped with, nor shall any person use upon a vehicle, any siren, whistle, or bell, except as otherwise permitted in this section." The exceptions are authorized emergency vehicles, which must carry a siren, whistle, or bell audible from at least 500 feet, and commercial vehicles, which may carry a theft alarm that the driver cannot use as an ordinary warning signal. Motorcycles get the same treatment under Ark. Code § 27-20-104: a horn in good working order is required, "but no bell, siren, or whistle shall be permitted."
A train horn is legally a horn. It produces a sustained multi-trumpet chord, not a siren's wail or a whistle tone, so it is judged under the "unreasonably loud or harsh" standard rather than banned as equipment. Anything that mimics an emergency siren is off-limits on a civilian vehicle, full stop.
Penalties, inspections, and city noise codes
Chapter 37 has its own violations section. Ark. Code § 27-37-101 makes it a misdemeanor to drive a vehicle "equipped in any manner in violation of this chapter," or "to do any act forbidden or fail to perform any act required under this chapter." Because both the horn statute and the general penalty section come from Act 300 of 1937, the default penalty in Ark. Code § 27-50-304 applies where no other penalty is set:
| Conviction | Maximum fine | Maximum jail |
|---|---|---|
| First | $100 | 10 days |
| Second within 1 year | $200 | 20 days (or both) |
| Third or later within 1 year | $500 | 6 months (or both) |
Those are statutory ceilings. Court costs come on top, and a first horn ticket rarely comes anywhere near the maximum. Still, it is a misdemeanor on the books, not a parking-style civil fine.
Inspections, meanwhile, are a non-issue. Act 974 of 1997 — "An Act to Streamline the Vehicle Registration Process" — repealed the requirement that vehicles be inspected before registration, along with the $3.50 inspection fee. There is no annual safety lane in Arkansas where anyone would look at your horn. That puts Arkansas in a different position from states that still run annual safety inspections, where an officer or inspector may check the horn.
City ordinances are where Arkansas gets stricter. Little Rock's Code of Ordinances § 18-52 bans "unreasonably loud, disturbing and unnecessary noise" and specifically lists "the sounding of any horn or signal device on any automobile, motorcycle, bus, streetcar or other vehicle while not in motion," except as a danger signal, plus "any unreasonably loud or harsh sound" and sounding a horn "for an unnecessary and unreasonable period of time." A separate Little Rock section bans blowing a car horn while parked at a drive-in restaurant. That means a parked horn demo in town can draw a city citation even when the state statute is debatable. Expect similar nuisance-noise language in other Arkansas cities, and check your local code before you test in town.
Where a portable battery train horn fits in Arkansas
Arkansas's mix — no decibel cap, no inspections, a "publicly maintained" highway definition, and a lot of private farm, timber, and hunting ground — suits a portable horn well. A battery-powered train horn that runs on the cordless tool packs you already own never touches your truck's wiring. It rides in the cab on the highway, moves to the side-by-side for pasture work, and goes to the boat ramp or deer camp without an install.
Sound tiers run from dual-trumpet models around 130 dB through quad setups at 140 dB. At the top end, the Extreme Series Train Horn for Milwaukee® 18v Battery reaches 150 dB+ on a Milwaukee® M18™ pack, and its wireless remote works from up to 2,000 feet — enough to signal across a field during harvest or call a crew in from the far end of a property.
Two practical notes. First, on a public road the "reasonably necessary" rule applies to any horn you sound from your vehicle, portable or not, so treat it as a warning device there. Second, 150 dB at close range is a real hearing risk for you and anyone near you; our guide to train horn hearing safety and safe distances covers how far back to stand and when to wear protection.
FAQ
Is there a decibel limit for vehicle horns in Arkansas?
No. Ark. Code § 27-37-202 requires a horn audible from at least 200 feet and bans "unreasonably loud or harsh" sound, but no Arkansas statute sets a maximum decibel level for a vehicle horn. Reasonableness is decided case by case.
Can I get a ticket just for having a train horn installed?
The equipment ban in subsection (b) covers sirens, whistles, and bells, not horns. In practice, Arkansas horn citations follow use: sounding the horn on a public road when it was not reasonably necessary, or in a way an officer judges unreasonably loud or harsh.
Does Arkansas inspect vehicles?
No. Act 974 of 1997 repealed the requirement that vehicles be inspected before registration, so there is no periodic safety inspection to fail.
Can I use a train horn on my own land in Arkansas?
The state horn statute applies on publicly maintained streets and highways, so private farms, leases, and driveways fall outside it. City and county noise ordinances can still apply, especially in town and at night, so keep recreational blasts short and in daylight.