“Defensive Driving” added no new protocol to what should have been, and still should be, universal knowledge of motorists.
What it perhaps usefully did was emphasise and prioritise that, alongside good knowledge of the rules and standard processes of driving, safety demanded a state of mind, an attitude, that was aware of and ready for human error.
Fifty-four years ago, the world invented a new road safety concept. It was called “Defensive Driving”.
Not a very catchy title, but not a bad idea and for a while it became a popular buzzword to the extent that even today most people will recognise the phrase. There were (and probably still are) defensive driving courses, worldwide, well subscribed.