It's all very fine, and most us would agree with the principle of tailgating, lane hogging, etc,etc.
But its like mobile phone users & everything else traffic related.
The Police do not have the finances currently to have "traffic cops" on the highways & byways to monitor these indiscretions.Allegedly.So , who's going to catch them?
But, if, when caught, it saves them (plod) paperwork, so they can issue a fine & points straight away without going to Court.
Personally, I think it will make no difference whatsoever.