Disclaimer. This page summarizes publicly available Mississippi statutes as of April 2026 and is published for general informational purposes only. It is not legal advice. Statutes change — verify the current text and consult a licensed Mississippi attorney.
- Legal status
- Legal
- Install permitted
- Statute
- §63-7-65
- Miss. Code Title 63
- Audibility required
- 200 ft
- Factory horn minimum
- Specific dB cap
- None
- "Unreasonably loud" test
- Siren/whistle ban?
- Yes
- Emergency exempt
- Penalty
- Traffic violation
- Civil fine
Are train horns legal in Mississippi? Short answer
Installing an aftermarket train horn on a private vehicle in Mississippi is not prohibited. Mississippi train horn law sits in Miss. Code §63-7-65. Standard UVC pattern: 200-ft audibility, “unreasonably loud or harsh sound or whistle” ban, horn use limited to safe-operation cases, siren/whistle/bell prohibited outside emergency vehicles.
Install is legal; novelty use on public roads in Jackson, Gulfport, Hattiesburg, Tupelo, or Biloxi is the regulated behavior.
What Miss. Code §63-7-65 actually says
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 (200) feet, but no horn or other warning device shall emit an unreasonably loud or harsh sound or a whistle. The driver shall, when reasonably necessary to insure safe operation, give audible warning with the horn but shall not otherwise use such horn when upon a highway.
Operative rules: 200-ft audibility · unreasonably-loud / whistle ban · safe-operation use limit · siren/whistle/bell prohibited outside emergency vehicles.
Does the factory horn need to stay working in Mississippi?
Yes. §63-7-65 applies to the vehicle as a whole. Keep factory horn wired; train horn on separate dedicated switch.
Is a train horn a “whistle” under Miss. Code §63-7-65?
- ·Siren — variable-pitch continuous tone
- ·Whistle — single-tone pressure device
- ·Bell — fire / warning bell
- ·Emergency vehicles exempt
- ·Multi-note chord, not a whistle tone
- ·Install not banned
- ·Use subject to "unreasonably loud" test
Portable and battery-powered train horns in Mississippi
§63-7-65 regulates “a horn or other warning device” without distinguishing power source. Milwaukee M18, DeWalt 20V, Ryobi ONE+, and Makita LXT portables fall under the same rules.
Enforcement in practice
Mississippi is broadly permissive. Jackson, Gulfport, Hattiesburg see more complaint-driven enforcement; rural counties rarely cite.
Practical Mississippi train horn compliance
- 01 Keep the factory horn wired and functional
The 200-ft rule applies to the vehicle as a whole.
- 02 Put the train horn on a separate switch
Distinct from the OEM button.
- 03 Use the factory horn for ordinary signaling
Safe-operation limit under §63-7-65.
- 04 Reserve train-horn use for off-road / events / private property
Mississippi has substantial rural and farm land.
- 05 Watch Jackson / Gulfport noise ordinances
Municipal codes layer on state law.
- 06 Hearing protection when testing
140+ dB causes immediate damage.
How to verify this page
Mississippi Code sections can be amended. Before acting on anything here, verify the current text on the Mississippi Legislature’s official portal and consult a licensed Mississippi attorney. If you notice this page is out of date, please send a correction.
Nearby states & related laws
All 50 states →Alabama
Alabama Code §32-5-213 covers vehicle horns. Installing a train horn is not prohibited, but unreasonably loud use is citable. Plain-English statute summary.
Louisiana
Louisiana train horn law (La. R.S. §32:351): vehicle horn rules, New Orleans and Baton Rouge enforcement. Plain-English guide with statute citation.
Tennessee
Tennessee train horn law (T.C.A. §55-9-201): vehicle horn rules, Nashville / Memphis enforcement, aftermarket horn regulations. Plain-English guide.
Arkansas
Arkansas Code §27-37-202 covers vehicle horns. Install is not prohibited; unreasonably loud use is citable. Plain-English summary with official sources.
Continue on Train Horn Hub
All 50 states
Full state-by-state legality index with statuses, citations, and decibel caps where defined.
Decibel distance calculator
Inverse-square-law tool that shows perceived loudness at any distance from the horn.
Battery-powered platforms
Horns organized by cordless-tool battery — Milwaukee M18, DeWalt 20V, Ryobi, Makita.
HornBlasters Shocker XL review
154 dB four-trumpet flagship kit — measured output, install notes, and verdict.
Sources & Citations
- [1] Mississippi Legislature — Code Title 63 (official portal)
- [2] Mississippi Code §63-7-65 (Justia)
Educational content. Not legal advice. Verify current statutes with your state DMV or a licensed attorney before installation.