Who's more dependable than a bus driver? Every day you travel the same route, making sure your passengers get to work or school on time, no matter what's going on with the weather or the roads. Nothing stops you except maybe a blizzard, and even then you're going to give it your best unless those wussies declare a snow emergency. You fire up your coffeemaker and your bus and you're always ready to roll. If they can't trust you, who can they trust? They don't want to make you stop this bus right here, do they?