thanks to all of you for your comments here. You have given me plenty to work with.
Also I grew up in N.J and had to run the "airport" circle near Philli almost every day (before they did the flyover.) This one is on Martha's Vineyard. Lots of debate about it. We currently have a 4 way stop...
my community is debating the wisdom of putting a roundabout at a busy intersection.
we currently have a 4 way stop, and traffic backs up.
How much gas is used to accelerate your average 4000 lb vehicle from a dead stop ( as required by stop sign ) to 20 mph (apx speed to go through a...