ItsNotAboutTheMoney
Well-Known Member
We have them in Rhode Island, though I'm not sure anyone knows how they are supposed to work.
There's multiple-lane rotaries in Augusta, ME. Rotary law is simple here. Yield at entrance, allow traffic to change lanes to exit. Still, I know people who take alternative routes, particularly to avoid the larger of the two rotaries in the city.
The smaller rotary was made a roundabout several years ago, with a spiral design that means if you get into the correct lane as you enter, you don't have to cross traffic to exit.
Exit 113 of I-95 north of Augusta was changed a few years ago when a new hospital campus was built. Previously the exit was eastbound only, but it was changed to allow westbound traffic, with a rotary added each side of the overpass. Negative for eastbound traffic exiting I-95S, who now have to cross the two rotaries before getting back up to speed.
I don't think rotaries are particularly complicated for autonomy, but they are a good test.