There is almost never an "overage" because there is a driver assigned per route, but they also have a bunch of sub drivers who get paid to show up, wait, and maybe take a route whose driver didn't show up, but if not, they go home after getting paid for an hour of waiting.
That's the gist, but it's a bit more complicated than that; in the school district where I live, bus drivers who were assigned routes actually had two or three per day: one for an elementary school, one for a middle school, and one for a high school. Yes, they are that short-staffed. In fact, all of the buses are advertising paid training because they need drivers that bad.
When I quit on my second day because of the stress about being pushed to get kids to school on time rather than safely, and also feeling like I needed more training to be safe, the head of the transportation department desperately tried to get me to stay.
tl;dr: they have bus drivers on standby who get paid to wait in case routes need to be filled. And they are so understaffed that overages never happen and drivers handle 2 or 3 routes.
Staggering school bus service isn’t that uncommon, I don’t think there are many school districts where their bus drivers only need to drive one route rather than 2 or 3. Not only can the drivers be employed for most of the day, but the bus itself gets more use.
I moved around a lot as a kid so got to participate in many different school districts. Talking to the school bus driver they all talk about their schedules.
There is almost never an "overage" because there is a driver assigned per route, but they also have a bunch of sub drivers who get paid to show up, wait, and maybe take a route whose driver didn't show up, but if not, they go home after getting paid for an hour of waiting.
That's the gist, but it's a bit more complicated than that; in the school district where I live, bus drivers who were assigned routes actually had two or three per day: one for an elementary school, one for a middle school, and one for a high school. Yes, they are that short-staffed. In fact, all of the buses are advertising paid training because they need drivers that bad.
When I quit on my second day because of the stress about being pushed to get kids to school on time rather than safely, and also feeling like I needed more training to be safe, the head of the transportation department desperately tried to get me to stay.
tl;dr: they have bus drivers on standby who get paid to wait in case routes need to be filled. And they are so understaffed that overages never happen and drivers handle 2 or 3 routes.