Architecture firm NBBJ has come up with a design that could change the way Londoners use public transportation: a three-lane walkway replacing the trains on the London Underground’s Circle Line. The three adjacent walkways would have different speeds, allowing commuters to adjust to the slowest speed before moving to a faster one. NBBJ’s proposal could make commute quicker and more efficient for its users, as it would not have the time spent on trains waiting at each station. What do you think about this interesting concept?