What is an example of a single-channel, multi-phase queue?

A drive-thru at a limited menu fast service facility exemplifies a single-channel, multi-phase queue because it involves one main point of service (the drive-thru window) where customers wait and progress through distinct stages of service.

In this scenario, customers first place their orders at the speaker box (the first phase), then they proceed to the next phase which involves paying and receiving their food at the window. This setup illustrates how customers enter a single channel (the drive-thru line) and pass through multiple phases (ordering, paying, and receiving their meal) before completing their interaction with the service provider. The drive-thru system is designed to efficiently handle a high volume of customers in a structured manner, making it an effective example of a single-channel, multi-phase queue.

In contrast, other choices represent different queue types; for instance, a bank teller line during busy hours typically involves multiple tellers working in parallel, which signifies a multi-channel, single-phase queue. A phone queue for customer service generally functions as a single-channel, single-phase system, as callers wait for the next available representative. Lastly, a restaurant with multiple lines for different services indicates a multi-channel system where customers can choose from different service points rather than following a