> So you are saying that oncoming traffic *doesn't* need to know which way
> > a car is going to go before it enters a roundabout,
>
> Correct. Its coming your way whatever
>
> > and *doesn't* make
> > go/no-go decisions based on the signal that the oncoming car gives? >
> Not before it enters, no
>
Roundabout I regularly use. Traffic entering from 3 o'clock can turn off at about 5 o'clock, 8 o'clock or 11 o'clock. It really, really helps, if they are taking 5 o'clock, that they are indicating *before* they enter the roundabout. Otherwise you have to wait until they commit (or indicate) to 5 o'clock before you can safely enter the roundabout. And it is only a short distance.