On the roundabout thing; about 50 metres up the road from us there is a small (not mini) roundabout. It's single lane entry on all four roads, and yes, you might be able to tell that that car is a little towards the left, but it's one lane. You might be able to tell that they're driving slightly more slowly, but as the road is used as a rat-run to avoid the rail crossing, a lot of the time people pull around and speed along.
I can usually tell if someone's going to turn left even if they're not indicating. I get it wrong once every couple of months.
My kids cannot cross that road. They have been taught to look at each of the three corners, and to check for speeding cars or indicators, but there are too many who look like they're going straight on but who swing left.
Fine, if there really is nobody around at all, but the shear volume of the idiots who simply cannot be arsed to flick a lever when there is a family standing right there trying to cross makes the road a death trap.
The solution could be simple; indicate. It costs nothing.