Are priority vehicles on emergency duty permitted to use only the light signal?
A)No, they must simultaneously use both the light and acoustic signal.
B)Yes, when travelling on an urban road.
C)Yes, when it poses no danger to other road users.Correct
Priority vehicles travelling on emergency duty will signal their presence by simultaneously using the light signal and the special acoustic signal device. Their drivers may use the light signal alone when omitting the special acoustic signals poses no danger whatsoever to other road users.
Other road users must give way to them even if they only signal with the light signal.