Quote:
Originally Posted by MichaelS
There is a roundabout with lights at all 4 entrances here in Brisbane. ......
It is kind of odd that Brisbane seems to be moving in the opposite of Calgary. Here, I get many calls from residents (I work for the Department of Main Roads) wanting to have roundabouts removed and replaced with signalized intersections.
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There is one in Alberta - 118 Ave & St Albert Road/Groat Road in Edmonton. It works quite well and was a big improvement over the regular traffic circle it replaced.
Traffic circles (politically correct term: round-abouts) do indeed work well in lower traffic volume situations. They break down on major roads when there is an imbalance in inflow. One entrance seems to get unrestricted access and constant flow. If the next entrance counterclockwise also has high volume, they get fewer chances to get in the circle and that traffic backs up. That's what happened to many of the old circles in Edmonton.