Do priority vehicles have right of way over all other road users?

A)Yes.
B)No.
C)Only when travelling on an emergency call.Correct
Priority vehicles in urgent service — whether public or private — shall have right of way over other vehicles and road users when they are performing such service and indicate this with their flashing light and special acoustic emission device. Exceptionally, they may use the flashing light alone when omitting the acoustic signal poses no danger whatsoever to other users.