answer:Well, this, at least, is what Wikipedia says: “Some vehicles, such as Hazmat vehicles and school buses are not legally allowed to turn on red under any circumstance and must wait for a green light or arrow. I never knew this but that’s what the Wik says. You may want to do further research. It kind of makes sense, as both school buses and Hazmat vehicles carry very precious and/or delicate cargo. Cargo you don’t want to take any chances with.