There is an overtaking button in the Plus 4 too. It is the big round one in the middle of the steering wheel
Ahh: Italian style of driving
Somehow the word "button" dropped out.
In Italian one of the terms used for a car horn is "Avvitatore acustico".
Dear me I seem to be a victim of spell correction An "Avvitatore " is a screw driver. What should have been written was "Avvisatore acustico" a term which is now used for reverse beepers and the now obligatory sound generation required for electric vehicles. In other words something or someone that gives an audible warning.