There was a video I watched years ago about a specialist who studies the flow of pedestrians and redesigns walkways to improve flow of pedestrians. I remember she was working on an airport and there were two hallways joined at a 45 degree angle with a minor outcropping of walkway right at the joint. A lot of people seemed to float around in the outcropping like turbulence, greatly bottlenecking the flow of people. She installed a clever partition to smooth the transition from one hall to the next and the bottle neck was resolved. Still can’t find that video. I always found it interesting.