👉 The metro fluid, also known as the metro stream or metro flow, is a concept in urban transportation that describes the smooth and continuous movement of passengers within a transit system, particularly in subway or metro networks. It represents the seamless transition between different stations and lines, where passengers move effortlessly from one stop to another without significant delays or bottlenecks. This fluidity is achieved through efficient station design, well-coordinated schedules, and adequate capacity management, ensuring that the flow of people is as uninterrupted as possible. The metro fluid is essential for maintaining high levels of service quality and passenger satisfaction, as it minimizes wait times and maximizes the overall efficiency of the transit system.