I know I know. School, that boring place where you learn the bare minimum to pass arbitrary tests let you out. Yay freedom. See, in my neck of the woods, school buses (probably as a cost cutting measure) do not do stops for High Schoolers. Makes sense in a way. Most kids are reaching legal age, and a chunk of students at 16+ years old quietly gain a clunker of a car to ride around in.
Some carpool or walk to school. High School is also where the weaklings are weeded out so the population going to said high school is thinner and thinner. So in a way it made sense to not waste the gas of the public school buses – public transit buses expend gas but go in a set route day in and day out.