> I was kinda wondering where they got the idea from :) Parts of the country have been using roundabouts in highway interchanges for years. Western Colorado ha

> I was kinda wondering where they got the idea from :) Parts of the country have been using roundabouts in highway interchanges for years. Western Colorado has a number of them. This one is close to 20 years old: https://www.google.com/maps/place/39%C2%B037'37.8%22N+106%C2%B029'45.9%22W/@39.627169,-106.4971179,345m/data=!3m2!1e3!4b1!4m4!3m3!8m2!3d39.627169!4d-106.496076?entry=ttu https://www.google.com/maps/place/39%C2%B037'37.8%22N+106%C2... Another one that is basically five roundabouts in a row: https://www.google.com/maps/place/39%C2%B038'12.9%22N+106%C2%B031'18.4%22W/@39.636908,-106.523182,689m/data=!3m2!1e3!4b1!4m4!3m3!8m2!3d39.636908!4d-106.521771?entry=ttu https://www.google.com/maps/place/39%C2%B038'12.9%22N+106%C2... I know of at least two others along that same stretch of highway.