Roundabouts aren't great for pedestrians. You need to trust the drivers' signals.

Where I'm from it's exactly the opposite - straight road means you can't trust drivers to slow down, but any obstacle like a big mound with a road in a circle around it makes them pay attention

They look at the mound, not the people trying to cross.

They slow down to look at the mound, turns out it helps noticing pedestrians

People slow down at stop signs to

I would love it if roundabouts caught on in the states, at least the single-lane ones. Multi-lane and the huge ones with traffic lights always scared me when driving in the UK.