Queuing theory is the mathematical study of waiting lines and queues. From the video, how is queuing theory used to understand traffic flow? Select all that apply. \( \square \) A. It is used in intelligent transportation systems. \( \square \) B. It is used on web servers to manage web traffic. \( \square \) C. It is used in mainframe computers of telecommunications terminals. \( \square \) D. It is used in airports to manage traffic of people.

Queuing theory has a pivotal role in intelligent transportation systems (A), as it helps design and optimize traffic flow by analyzing patterns of vehicle arrivals and departures, ensuring smoother commutes and reduced congestion. By modeling these queues, city planners can predict peak periods and implement strategies like traffic signals and lane adjustments to enhance efficiency. Moreover, airports (D) utilize queuing theory to manage the flow of passengers. By examining the lines at check-in, security, and boarding, airports can optimize staffing and processes to minimize wait times, thus improving traveler satisfaction and the overall experience. The application of queuing principles ensures that the hustle and bustle is managed effectively!