Being on time

I am very time oriented when I work. I used to do fixed price contracts and you had to know how long things took to do that. One of the things people don't seem to understand is that if you want to be somewhere on time you have to leave on time. If a meeting runs late it pretty much guarantees you will be late for the next meeting, which may in turn make that meeting run late. If everybody showed up on time and used the meeting time effectively the meeting would end on time. Simple, but lots of people don't seem to get it.