School buses

Why is it that a school transportation department can pick up hundreds of children and take them to school every day, but can't seem to show up when they say they will with my son? We've been going through some changes with my son's schooling, and because of this, he's had to start taking an earlier bus to school. We were told that my son's bus, #70, would arrive at 10:35 to pick my son up so that he could be to his class at 11:00. That is more than enough time to cross town to his new kindergarden class. We didnt have school on Monday, but the rest of the week had nothing but problems with his bus. Tuesday the bus arrived at 10:25. I figured ok, no problem. The driver is probably just adjusting her timeframe. Wednesday the bus arrived at 10:15. This annoyed me quite a bit since my son wasnt really ready to leave yet. I called the bus barn Thursday morning around 10:00 to make sure the bus would be on time that day. Of course, they assured me the problem was taken care of. Well, at 10:50 I finally got tired of waiting, and took him to school myself. And then, for some reason, the bus stopped outside our house Friday to pick him up. My son doesnt go to school on Fridays. Due to my son's transitioning school schedule, he'll be leaving even earlier starting Monday and I can only hope that maybe the transportation department can get their act together long enough to take one little boy to school.