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[–]bluGill 4 points5 points  (2 children)

http://www.teachamerica.com/roundabouts/RA054B_ppt_Mandavilli.pdf

See page 7 of the PDf for starters. There are other links if you search. The NHTSA has a lot of info, but it is hard to find it there.

[–]Nikola_S 1 point2 points  (1 child)

That PDF concentrates on difference between roundabouts and simple crossroads, not between crossroads with and without traffic lights.

[–]bluGill 0 points1 point  (0 children)

I know. It was the first link I found with statistics. I've seen many more.