How do hand signals vary between countries? There are several conventions on how to signal properly


The simple method (straight left arm = left, straight right arm = right)
This answer on SE depicts a left-arm-only way of signalling (straight left arm = left, bent 90 up = right)


I'd like to know where should one use which singalling convention? I'm personally mostly concerned about Europe, but let's keep the question general.
Both question linked by Neil are rather comprehensive for the US and UK. Wikipedia (though not the greatest resource) seems to have a nice, even if short, list of arm signals in various countries.

I live in Denmark, and while I couldn't find a trusted resource for it (there are a number of blog posts, though), I'd say the convention is to use straight left and right arm signals. And in reality they are something between a straight and a bent arm, so it only matters which arm is used.

Finally, Lithuanian traffic rules (note: it's in Lithuanian) indicate the following:


To turn right, use straight right arm or bent left arm
To turn left, use straight left arm or bent right arm
To stop, use either left or right arm straight up