Ambulance

Only if an ambulance carries the optical, blue, and sound signals is it considered a priority vehicle according to the law and of course at the CBR.
I can imagine situations where the use of loud sound signals is not desirable. Think logically in these situations and give the ambulance free passage.

If you get questions about a priority vehicle at the CBR, keep in mind that you only make room when possible, and never reduce or increase your speed. Also, you are not going to do things that are prohibited such as driving on an emergency lane to make room, or driving through at a red traffic light.