There was an important reason why roundabouts don’t work as well in the U.S. and work better in England. In England drivers always yield right of way.
In the U.S., drivers are in a hurry. Here are two examples.
In Monroe, U.S. 2 near the fairgrounds going westbound is a right-turn only lane. I see cars use the lane not turning right and merge at the last minute and slow down traffic.
Monroe’s U.S. 2 original ramp going westbound has a sign, “must STOP for pedestrians.” Cars ignore the sign!
The cops could make a lot of money just giving out tickets for cars who do not stop for pedestrians. They could also save a few lives at the same time. DOT made a longer approach to this ramp so cars are at a higher speed.