What is the significance of the repeated warning against changing at Bank station?

The repeated warning against changing at Bank station is due to the station's unique layout and the high volume of passengers it handles daily. Bank station is one of the busiest stations in London and is a major interchange for several lines of the London Underground, including the Central, Northern, and Waterloo & City lines. The station's complex layout, with multiple levels and platforms, can be confusing and disorienting for passengers who are not familiar with it. Changing lines at Bank station can be particularly challenging, as passengers may have to navigate multiple levels and pass through different ticket barriers to reach their connecting line.

The warning against changing at Bank station is intended to reduce congestion and improve passenger safety. By encouraging passengers to use alternative routes or stations to change lines, London Underground can reduce the number of passengers passing through Bank station, thus reducing the risk of accidents or delays. The warning also serves to alert passengers to the challenges they may face when changing lines at Bank station, giving them the opportunity to plan their journey and navigate the station more easily.