Sound truck

A sound truck is a vehicle equipped with a public address system and loudspeakers, typically used to play recorded messages at high volume to the public while driving through residential areas.

They are also used by public safety 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,[citation needed] and has been criticized as an example of attention theft.

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

In Bagé, Rio Grande do Sul, Brazil, the level of the sound cannot exceed 65 decibels.