Which is not something anyway wants. People need ridged predictable schedules so they can figure out how to plan their life. There are spontaneous trips people make (I burned supper - guess we are going out to eat tonight). Meetings sometimes run late, and sometimes end early, sometimes I want to stay around and chat after the meeting sometimes I want to get right home. I need instant flexibility and predictable routes gives me that since I don't have to meet their schedule. Meetings always start on time - flexible routes too often will not be predictable because they detour for someone else. Meetings often don't open the door until a few minutes before - predictable lines mean I can tell the person with the key when I'll be there and I will be right (important if it is bad weather)

Flexible routes remove the mass from mass transit.