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When I started driving here, there were "traffic circles" which were two lane roundabouts. They are nothing new as that was 45 years ago. As far as overpasses, they are much better for limited access roads with much higher traffic volume. The two lanes entering the Hampton Roads Bridge Tunnel can see 86,000 vehicles in 24 hours, on just the eastbound 2 lanes.
At 420 cars in 15 minutes, obviously a roundabout would never work for that kind of traffic volume. On US1 in the Florida Keys, I have watched people wait 15 minutes to make a left turn in very heavy traffic with no lights to break the flow. I would just go right and make a u-turn shortly after.
On my typical drive, which involves 46 lights in 40 miles, they could eliminate half of them and make those roads right turn only. At least they are decently timed, even though you have to go 3-5 over the limit to stay in the timing "sweet spot".
regards
Mech
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