It was a silly "Euro" thing that ended up all bikes after a certain date ( cant remember when ) with twin lamps up front only have one on when low beam was switched on.
Previous to that date, older bikes like EXUP's, old shape Gixxers and ZXR's etc, all had two lit headlights up front.
I find it a bit daft really and as some folk have already said:-
One light or two, whats the difference?. If a driver is sat at a junction and sees either one light or two approaching to pass, why on earth would he/she pull out in front of the vehicle?.
Also agree with previous postings regarding noise from exhausts.
Anything and I mean
anything that helps other "sloppy" not paying attention road users, realise there is a two wheeler approaching is good in my book, which is why despite having been stopped and fined on a few occasions for an unbaffled race can, I will continue to use my RSV with a seriously deep base toned, "illegal" and rather loud Blue Flame race can on it no matter what.
Simply because the noise it makes has saved my bacon on more than one occasion where Mr.McGoo has failed to see me but thought "What on earth is that noise?" and had a look around his peripheral area before moving off.....