David Hembrow posts a video called Roundabout with Safe Cycling Facilities in The Netherlands. It’s standard practice in The Netherlands to provide a bicycle circulating lane on all roundabouts, separated by small curbs.
Here in the U.S., .this type of design is strongly discouraged by every set of roundabout guidelines I’ve ever seen. The reasons generally are as follows:
- U.S. Cycling behavior is different
- U.S. driving behavior is different
- Lower bicycle mode share