* Jaywalking makes.. what harder?
* In the UK, roundabouts are marked with areas for pedestrians to cross but they are not crossings? What are they, then?
* You don't have to wait
* But also you can't expect traffic to stop for you
* What do you do if it does not become clear?
Crossing the road without a crossing or light or whatever explicitly telling you that you can do it.
> In the UK, roundabouts are marked with areas for pedestrians to cross but they are not crossings? What are they, then?
They are indented areas where the road (and often the centre barrier just before the roundabout) is marked for pedestrians but traffic is not obligated to stop. You cross the road when it is safe
> What do you do if it does not become clear?
If it was such total gridlock you can just cross in between traffic that is not moving?
When I lived in Nashville, I spent a lot of time near a roundabout, and even after they redid it to be a bit better I still had to avoid it for my own safety. The light-controlled intersection next to it was much less of a problem.
From an advanced driving course I got to do years ago (for free), I learnt that the pedestrian island counts as part of the roundabout, so a pedestrian crossing or on the island should be given way to finish crossing when entering the roundabout [1].
Doesn't always happen in reality.
There is also this idea in Australia that you always give right of way to cars entering on your right (left for US) which is not an actual rule; as in if you are waiting at the line you count as being on the roundabout.
Unfortunately, you will often see cars on the major road blast through a small roundabout with no regard to anyone waiting to enter from the lesser road, making entering the roundabout from that side a stop rather than an equal give way.
[1] Edited for clarity