Once upon a time, a pretty girl wearing a skimpy uniform and roller skates (!) would bring your food out on a tray and attach it to the car.
Carhop service is largely gone now, replaced by drive-thru windows. But it survives in a few places, including the Sonic chain with locations in 43 states. Info:
www.sonicdrivein.com This "food" in this image is all fake, for display at a car show. And unfortunately the prices aren't real either.