There’s some rural highway intersections near where I live that have been getting the stop signs replaced with roundabouts and similarly people keep complaining because they have to slow down but these are intersections that happen to have frequent fatal collisions because people aren’t slowing down. One of them has already had multiple single vehicle collisions where a driver just blasted into the center of the roundabout so the roundabout is clearly working at forcing traffic to calm down a little

Edit to add: there’s another rural highway intersection that was a 2 way stop for quite some time. The county is getting ready to install a roundabout so they started by turning it into a 4 way stop. The new stop signs have a gantry arm over the road, flashing lights, signs 500 feet back saying “stop ahead” with flashing lights and signs 500 feet earlier than that saying “new traffic pattern” also with flashing lights. People have continued to blast through that new stop sign ignoring all of the new signage and flashing lights where previously there wasn’t a single sign or light. Now I see regularly the sheriff parked just out of sight watching that intersection because drivers can’t be trusted to follow basic traffic safety laws and not blast through a stop sign at 65+mph (in a 55 zone of course)