Maz said:
Are you having a laugh? The worrying thing is, I don't think you are.
It is still in many states' rules. It dates back to pre-indicator-of-any-kind cars, when, if you signalled right in the same way you signalled left, you would punch your passenger in his/her left ear, so car drivers stuck their left arm out of the driver's side window and held up the upper arm at right angles.
Since US drivers might be confused by a cyclist signalling right by putting his right arm straight out in the same way as he would put his left arm straight out to signal left, they decided to make the cyclist's right turn signal the same.
Unfortunately, when Wagon Train became popular, it led to large numbers of Connestoga wagons drivers getting confused between the Ward Bond "Wagons Roll!" signal and the rh turn signal, which led to a considerable number of cyclist/covered wagon collisions.
Aren't you glad your ride in the UK?