I never heard about this being used on school busses. This was always something for emergency services like firetrucks/ambulances to not have to sit in traffic

I never heard about this being used on school busses. This was always something for emergency services like firetrucks/ambulances to not have to sit in traffic at a red light, but it was only active if they were actively responding to a call with their lights on. Otherwise, they sit at the lights too.