Despite some claims to the contrary, drive-in movie theaters in the United States are not making a comeback. In 2017 there exist about 330 operating drive-in theaters in the United States, down from a peak of about 4,000 in the late 1950s. In 1980, there were over 2400.
Back in 1960s, there used to be drive-in clinics for the polio shots in Los Angeles.
Photos via historyloversclub.com