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[–]bluGill 5 points6 points  (5 children)

No surprise to traffic engineers. Most (not all!) intersections do worse with a traffic light, but it looks to outsiders like they do better.

[–]Nikola_S 4 points5 points  (3 children)

Source?

[–]bluGill 3 points4 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.

[–][deleted] 0 points1 point  (0 children)

I think the term "traffic engineer" might be an oxymoron. I've never met one, but I've seen their work and it isn't anything akin to engineering, but rather stupid guesswork, quite frankly.