[arthurus]

In most American cities traffic circles do not make sense. They were designed long long ago in lands where inbound roads all led to central points in cities so that the main intersection might have 7 or even a dozen streets converging on a point. In the modern context such an intersection with lights would be nonsense and one would wait half a day for for a green light. In an American city laid out on a grid a roundabout just confuses things. In my little town the city put in several of these things in order to be "up to date" and "modern" and truth to tell- fashionably European. None of them is more than 100 feet in diameter.

Tulsa OK has a very well designed circle on the north side that keeps traffic running smoothly and does not slow it down. It is two lanes with the outside lane for entering and turning out or for going just to the next exit. It is the only American one of these things I have seen that seems to work well and as intended. Actually I suppose the circles here do what is intended namely they are badges of fashionability and payoffs to the road construction company that donated lots of money to the mayor's election campaign.

[Teacher317]

Looks like 12 in-roads on this one...

[zeugma]

Tulsa OK has a very well designed circle on the north side that keeps traffic running smoothly and does not slow it down. It is two lanes with the outside lane for entering and turning out or for going just to the next exit. It is the only American one of these things I have seen that seems to work well and as intended. Actually I suppose the circles here do what is intended namely they are badges of fashionability and payoffs to the road construction company that donated lots of money to the mayor's election campaign.

A roundabout needs two lanes and plenty of space in order to function well. If you don't have enough room for that, stoplights will work better.