So many don't take notice of them anyway.

How about a road sign at roundabouts banning drivers who are going straight on from indicating right and keeping it on.
This would save me from waiting to enter the roundabout whilst some doughnut vears off at the first exit whilst indicating right.
Just indicate left as you pass the first exit.....Simple.

I now stay in the Philippines and it really is wonderful driving here. If there are rules no one has published it in book form. If you see a space while driving just fill it It Does not matter if it is the right lane for where you are going. Junction ? Play game of chicken, you keep going untilyou or the othe driver backs down. As I say great fun.

This idea works in many places abroad as the rest of europe has higher driving standards(germany has motorways where the speed limit is pretty much whatever your car can do)than the UK.Try the same here and the ignorant,aggressive UK motorist would sooner have an accident than give way to say a bus or taxi.