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 speaker driver) is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound. A ''speaker system'', also often simply referred to as a "speaker" or " ...

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 referend ...

s, and in some countries for

commercial advertising A television advertisement (also called a television commercial, TV commercial, commercial, spot, television spot, TV spot, advert, television advert, TV advert, television ad, TV ad or simply an ad) is a span of television programming produce ...

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 ensure ...

authorities during emergencies, such as evacuations, 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 distr ...

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

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

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

Bagé Bagé () is a city located in the state of Rio Grande do Sul, Brazil. In 2020, its population was 121,335 in a total area of 4,096 km2. It was the seventeenth largest city in the state according to the 2011 census. The city was founded in 181 ...

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 st ...

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

, 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 or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a po ...

Notes

External links

* Kovacs v. Cooper on

Wikisource Wikisource is an online digital library of free-content textual sources on a wiki, operated by the Wikimedia Foundation. Wikisource is the name of the project as a whole and the name for each instance of that project (each instance usually rep ...

*http://mesound.net/ME_Sound/Sound_Trucks.html Advertising by medium Sound production technology {{car-stub

See also

Notes

External links