Logical?  You really think that traffic will ever go away?  Every major city in the world has traffic to some degree.  There will always be extreme situations like water main breaks and when the zipper lane couldn't close that will create a catastrophe.   How can you plan for bizarre situations like that?  Some times, life doesn't go as planned.  Not pleasant, but we just have to move on.  I do agree that those who perform these duties are every day heroes for all they do.