At least the school district Mr. Sirius works for has a system where school closures, etc. are announced on the radio, and if the entire district is closed the drivers don't have to report. There was one year when the roads got extremely icy, and rather than call school out for the day or even do a late start a supervisor who had never been a bus driver herself (so how she ended up supervising bus drivers is anyone's guess) insisted that the bus drivers come in and have business as usual. One of the earlier buses, which had to go to a high elevation, slid into a ditch (no students on board). She was all set to go out and chew the driver out, and as she drove up she also slid into the ditch. The school district was closed for the day, and that supervisor was soon transferred. Now the supervisors are all former drivers who have the drivers' and the students' welfare in mind first and foremost.
Although Mr. Sirius told me this morning that a trip he'd taken to pick up a preschooler could have gotten quite interesting, as the directions he'd been given called for him to take an off-ramp off the freeway that didn't actually exist yet (under construction).