a menu board Newer drive-throughs feature a LCD or LED display within the speaker system in order to show the full order and total cost to avert order errors through miscommunication. At many brands of restaurants, a secondary display featuring the total is placed directly next to the order window. This is to ensure that the customer will know if the cashier intentionally overcharges them. Windows where employees interact with customers by processing the customer's payment and giving them their order. Most drive-throughs have either one window serving both functions, or two windows with the first being used for payment and the second used for retrieving the order. Most restaurants have marked parking spaces just beyond the last window. If there is a significant delay in an individual customer's order (e.g. a special order), an employee may direct that customer to park in this area, clearing the drive-through lane for the next customer and preventing knock-on delays to other customers. When the order is ready, an employee hand-delivers the order to the customer. This service therefore occasionally has some similarities to drive-in service, but only during peak periods. Drive-through designs are different from restaurant to restaurant; however, most drive-throughs can accommodate four to six passenger cars or trucks at once (called the queue). Most drive-through lanes are designed so the service windows and speaker are on the driver's side of the car, for example, in left-hand traffic (right-hand drive) countries such as the UK, Ireland, Australia, India and New Zealand, the windows will be on the right side of the drive-through lane, and vice versa in right-hand traffic (left-hand drive) countries such as North America and mainland Europe. There are a few drive-through lanes designed with the service windows on the passenger side, but these lanes are disfavored as they cannot be used easily by cars with only a driver. According to a 2021 report in QSR Magazine, 42 percent of all customer traffic came to the drive up window. The fastest drive-through of 2020 in the United States was Taco Bell, with an average time of 4.46 minutes, followed by KFC with 4.53 minutes, 4.76 minutes at Carl's Jr and 4.91 minutes at Dunkin'. Coffee is sometimes sold at a drive-through coffee shops. History In 1921, Kirby's Pig Stand introduced the drive-in restaurant, in which carhops delivered meals. In 1931, a California Pig Stand franchise introduced a drive-through service