We have a more relaxed attitude to indicating in the UK than the Germans which may be why we have a lower rate of accidents than Germany, Netherlands and Poland which 3 times the rate of accidents compared to the UK....

I have often wondered how the uk has such a low road death rate. Pretty much the best in the world if you exclude some small island and city states where you cant really drive fast. But its certainly not due to indicating

I havnt driven enough in Netherlands and Poland to comment. But Germany the reason is obvious. Not only do they drive very fast on Autobahns (or are in very narrow contraflows) but its noticeable to me how many drivers are nervous of driving anywhere else, and cant drive round bends. If you are held up on a mountain pass or winding road its nearly always by a nervous driver in a large and powerful German registered car.
Other countries with high death rates are even more obvious. The further east and south you go the more drivers seem to assume that if you cant yet see something it does not exist. They frequently overtake on blind bends ,and even the official signing often allow overtaking until much too near a blind bend

They also often overtake a line of traffic with no safe 'landing place' to aim for ,trusting others will to let them in if they get into trouble.
You cant generalise of course.And it only takes a few incidents to push the statistics up. The UK has plenty of rubbish drivers.