OK, so somewhere around 10. Does he have any behavioral issues e.g. ADD or ADHD? And if the tardiness to the bus stop is a recurring issue why can't a parent walk him there and wait with him?
I'm not picking a side here, I have 3 kids, a 6yo girl, a 5yo boy and a 16 month boy. My daughter is impossible in the morning (most of the time really, although she has not been diagnosed yet she probably has ADD.) My older son, however, will be dressed and waiting for breakfast in 10 minutes once I drag him out of bed. I'm seeing a little of both sides here and I think the parents should be more involved in his morning routine, also the bus driver needs to not let himself become complacent with a continually tardy child. Complacency kills. Really that goes for all involved, driver, parents and child.
And the last question is the kid lying to save face with the parents? Blame the driver, obviously the parents were not there to witness this first hand.