[dylan604]

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.

[euroderf]

A newspaper article told of a mayor of some city that had one installed so he could zip along to emergencies.