>In my European experience roundabouts are better for cars safety
Correct - roundabouts reduce traffic fatalities in intersections quite signficantly.
>worse for bicycle safety (cars are driven closer to bikes)
I think this probably depends on design - if cyclists have a separated path with a raised crossing, then they are likely safer than intersections.
>use up more land,
Arguably true.
>increment gas consumption (almost stop and then go vs just go). The latter point could be debated because it's worse for the cars on the main road, better for the ones on the small ones.
Roundabouts generally replace signalled intersections, and compared to those, roundabouts are probably better (slow down/yield vs full speed/full stop).
Correct - roundabouts reduce traffic fatalities in intersections quite signficantly.
>worse for bicycle safety (cars are driven closer to bikes)
I think this probably depends on design - if cyclists have a separated path with a raised crossing, then they are likely safer than intersections.
>use up more land,
Arguably true.
>increment gas consumption (almost stop and then go vs just go). The latter point could be debated because it's worse for the cars on the main road, better for the ones on the small ones.
Roundabouts generally replace signalled intersections, and compared to those, roundabouts are probably better (slow down/yield vs full speed/full stop).