A sound truck is a vehicle equipped with a

public address system A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound sou ...

and

loudspeaker A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network). The speaker driver is an ...

s, typically used to play recorded messages at high volume to the public while driving through residential areas. They are used in many countries by groups to disseminate political messages, such as by candidates during

election campaign A political campaign is an organized effort which seeks to influence the decision making progress within a specific group. In democracies, political campaigns often refer to electoral campaigns, by which representatives are chosen or referen ...

s, and in some countries for

commercial advertising A television advertisement (also called a commercial, spot, break, advert, or ad) is a span of television programming produced and paid for by an organization. It conveys a message promoting, and aiming to market, a product, service or idea. ...

and promotion. They are also used by

public safety Public security or public safety is the prevention of and protection from events that could endanger the safety and security of the public from significant danger, injury, or property damage. It is often conducted by a state government to ensu ...

authorities during emergencies, such as

evacuation Evacuation or Evacuate may refer to: * Casualty evacuation (CASEVAC), patient evacuation in combat situations * Casualty movement, the procedure for moving a casualty from its initial location to an ambulance * Emergency evacuation, removal of pers ...

s, to get information quickly to local populations. The use of sound trucks for advertising is illegal in many jurisdictions, and has been criticized as an example of

attention theft Attention theft is a theory in economic sociology and psychology which describes situations in which marketers serve advertisements to consumers who have not consented to view them and who are given nothing in return. Perpetrators seek to Distra ...

. It is legal in Portugal and usually used during election campaigns by political parties. It is also legal in

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

. For the legal situation in the United States see ''Saia v. New York'' (1948) and ''Kovacs v. Cooper'' (1949). In

Bagé Bagé () is a Brazilian municipality located in the state of Rio Grande do Sul. In 2020, its population was 121,335 in a total area of 4,096 km2. It is the seventeenth largest city in the state according to the 2011 census. The city was f ...

Rio Grande do Sul Rio Grande do Sul (, ; ; "Great River of the South") is a Federative units of Brazil, state in the South Region, Brazil, southern region of Brazil. It is the Federative units of Brazil#List, fifth-most populous state and the List of Brazilian s ...

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

, the level of the sound cannot exceed 65

decibel The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a Power, root-power, and field quantities, power or root-power quantity on a logarithmic scale. Two signals whos ...

Notes

External links

* Kovacs v. Cooper on

Wikisource Wikisource is an online wiki-based digital library of free-content source text, textual sources operated by the Wikimedia Foundation. Wikisource is the name of the project as a whole; it is also the name for each instance of that project, one f ...

Advertising by medium Sound production technology {{car-stub

See also

Notes

External links