Although first created in 1932, drive-in movie theatres did not peak until the late 1950s. In its simplest form, the concept consists of a large outdoor screen, projection booth, concession stand, and parking area for automobiles. Various methods of getting the movie’s sound to the vehicles were employed over the years, from large speakers to individual speakers attached to the side window of each attending vehicle to low-power FM broadcasts for pickup on a vehicle’s internal radio receiver. Primarily popular in rural areas, at one point the nation had some 4,000 such theatres.