Otto Throttle.
…. then a simple "Stop! Stop! Stop!" would certainly get attention and perhaps produce the desired result most consistently.
You could well be right. The actual words used are programmed, by the user, from an internal library. ‘Stop Stop Stop’ is there as an option.
…. trained ourselves to ignore messages which are not preceded with our call-sign.
It’s probable that messages will be preceded by a very brief ‘alert’ tone – the Marker audio frequencies make sense.
Hansoff
Also, as the transmitter is located AFTER the line, surely incursion has already occurred by this point?
Quite right. One problem with incursions is that you never know they’re
going to happen. You only know
after they’ve happened. Immediately warning the crew that they’ve passed a Red Stop Bar should achieve the desired result - prevention of runway collisions.