Wiktionary
n. A vehicle equipped with loudspeakers, used for advertizing.
WordNet
n. a truck equipped with a loudspeaker and used for advertising
Wikipedia
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 used in many countries by groups to disseminate political messages, such as by candidates during election campaigns, and in some countries for commercial advertising and promotion. 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. It is legal in Portugal and usually used during election campaigns by political parties. It is also legal in Japan. 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.
Usage examples of "sound truck".
Four miles away in a sound truck two men sat in front of a sophisticated microwave receiving set.
Then he shook hands with Bill Davis and got back into the sound truck and left.
The Angels were quickly subdued by Berkeley police, but not before they managed to punch a few people, tear up some signs and rip microphone wires off the march leaders' sound truck.
And you recall the sound truck which was following you toward New London—.
A British armored sound truck inched down the middle of Ben Yehuda Street.
Eyepatch shoved the big man to the floor of the sound truck and stuffed the blackjack in his pocket.
The next arrival was a sound truck, which took up its position directly in front of the municipal building and began to blast forth gay march music from the horn attached to its roof.
Instantly a huge sound truck and three station wagons roared out from behind the grandstand and raced up.
Vitaly puts on goggles, hooks himself into a computer on the sound truck, and begins tuning the sys.
The drivers of the trucks, an oppressed minority of two, have retreated into the cab of the sound truck to smoke cigarettes and glare balefully at the swarm of thrashers, their sworn enemies in the food chain of the highways.
The sound truck's electronics isolate the bad circuit and shut it off before anything or anyone gets hurt.
Nod, you go down and hurry up the sound truck, then you can handle the door.