There are design standards for them… now(?). There may not have been in the past, or they were not as good given the lack of experience.
See also perhaps "International comparison of roundabout design guidelines":
* https://trl.co.uk/uploads/trl/documents/PPR206_secure.PDF
There are design standards for them… now(?). There may not have been in the past, or they were not as good given the lack of experience.
See also perhaps "International comparison of roundabout design guidelines":
* https://trl.co.uk/uploads/trl/documents/PPR206_secure.PDF