Nevada Revised Statutes

Nev. Rev. Stat. § 484D.400 (2026)

Horns and other warning devices

✓ current as of July 2026
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NRS 484D.400  Horns and other warning devices.

      1.  Every motor vehicle when operated upon a highway must 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 200 feet, but the horn or other warning device must not emit an unreasonably loud or harsh sound or a whistle.

      2.  A person driving a motor vehicle shall, when reasonably necessary to ensure safe operation, give audible warning with the horn, but shall not otherwise use the horn when upon a highway.

      3.  A vehicle must not be equipped with, and a person shall not use upon a vehicle, a siren, whistle or bell, except as otherwise provided in this chapter.

      4.  It is permissible, but not required, to equip a vehicle with a theft alarm which is arranged so that it cannot be used by the driver as an ordinary warning signal.

      5.  An authorized emergency vehicle may be equipped with a siren, whistle or bell, capable of emitting sound audible under normal conditions from a distance of not less than 500 feet, but the siren must not be used except when the vehicle is operated in response to an emergency call or in the immediate pursuit of an actual or suspected violator of the law, in which event the driver of the vehicle may sound the siren to warn pedestrians and other drivers of his or her approach. A driver of an emergency vehicle may operate the vehicle’s warning lamps without sounding the siren.

      6.  A driver of an emergency vehicle who operates the vehicle’s warning lamps without sounding the siren shall be deemed to have adequately warned pedestrians and other drivers of his or her approach for the purpose of determining whether the driver met the duty to drive with due regard for the safety of all persons pursuant to NRS 484B.700.

      [8:166:1925; A 1939, 316; 1931 NCL § 4357]—(NRS A 1987, 1343; 2001, 740)—(Substituted in revision for NRS 484.607)

     

Notes of Decisions
Cited in 7 cases (2 in the last 5 years), 2018–2023 · leading case: Susan Porter v. Kelly Martinez, 68 F.4th 429 (9th Cir. 2023).
Susan Porter v. Kelly Martinez, 68 F.4th 429 (9th Cir. 2023). “” Nev. Rev. Stat. § 484D.400(2). New Jersey: “The driver of a motor vehicle shall, when reasonably necessary to insure safe operation, give audible warning with his horn but shall not otherwise use such horn when upon a highway.”
Glover-Armont v. Cargile, 426 P.3d 45 (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Glover-armont Vs. Cargile, 2018 NV 49 (Nev. 2018). · cites it 2× “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Glover-amont v. Cargile, 2018 NV 49 (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Glover-armont Vs. Cargile, 2018 NV 49 (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Susan Porter v. Kelly Martinez (9th Cir. 2023). “” Nev. Rev. Stat. § 484D.400(2). New Jersey: “The driver of a motor vehicle shall, when reasonably necessary to insure safe operation, give audible warning with his horn but shall not otherwise use such horn when upon a highway.”
Glover-Armont v. Cargile (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
— Nev. Rev. Stat. § 484D.400(2) — 2 cases
Susan Porter v. Kelly Martinez, 68 F.4th 429 (9th Cir. 2023). “” Nev. Rev. Stat. § 484D.400(2). New Jersey: “The driver of a motor vehicle shall, when reasonably necessary to insure safe operation, give audible warning with his horn but shall not otherwise use such horn when upon a highway.”
Susan Porter v. Kelly Martinez (9th Cir. 2023). “” Nev. Rev. Stat. § 484D.400(2). New Jersey: “The driver of a motor vehicle shall, when reasonably necessary to insure safe operation, give audible warning with his horn but shall not otherwise use such horn when upon a highway.”
— Nev. Rev. Stat. § 484D.400(5) — 5 cases
Glover-Armont v. Cargile, 426 P.3d 45 (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Glover-armont Vs. Cargile, 2018 NV 49 (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Glover-amont v. Cargile, 2018 NV 49 (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Glover-armont Vs. Cargile, 2018 NV 49 (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
Glover-Armont v. Cargile (Nev. 2018). “See NRS 484D.400(5)-(6) (providing, among other things, that when an officer uses warning lamps without sounding the siren, the officer "shall be deemed to have adequately warned pedestrians and other drivers of [the officer's] approach for purposes of determining whether the…”
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