[bluGill]

Planes and medium distance trains have the advantage of being a rare. You have already know that if you are late it will be a long time before the next one, so you take extra effort to be there early. With a bus if you miss on, being 10 minutes late by catching the next one isn't as big a deal: it is only 4-5 minutes if you hurry (getting the first bus would average getting you there 5 minutes early, a little running and you can take another minute off). That is all fine, but if the next bus is running late you cross the "magical" 5 minutes late mark and get into trouble for being late.