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A drive-through or drive-thru (a sensational spelling of the word through), is a type of take-out service provided by a business that allows customers to purchase products without leaving their cars. The format was pioneered in the United States in the 1930s, and has since spread to other countries.
A drive-up window teller was installed at the Grand National Bank of St. Louis, Missouri, in 1930. The drive-up teller allowed only deposits at that time.
Orders are generally placed using a microphone and picked up in person at the window. A drive-through is different from a drive-in in several ways - the cars create a line and move in one direction in drive-throughs, and normally do not park, whereas drive-ins allow cars to park next to each other, the food is generally brought to the window by a server, called a carhop, and the customer can remain in the parked car to eat. However, during peak periods, to keep the queue down and avoid traffic flow problems, drive-throughs occasionally switch to an "order at the window, then park in a designated space" model where the customer will receive their food from an attendant when it is ready to be served. This results in a perceived relationship between the two service models.
Drive-throughs have generally replaced drive-ins in popular culture, and are now found in the vast majority of modern American fast-food chains. Sometimes, a store with a drive-through is referred to as a "drive-through", or the term is attached to the service, such as, "drive-through restaurant". or "drive-through bank".
Drive-throughs typically have signs over the drive-through lanes to show customers which lanes are open for business. The types of signage used is usually illuminated so the "open" message can be changed to a "closed" message when the lane is not available.

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