Revolving Door Rotary

“OK listen, for efficiency, safety and fairness, install a giant revolving door on one lane roundabouts.”
”Well, that’s awfully dumb. Why?”
”No criticism, we’re just brainstorming. Now, anchored on the circle’s island, the doors could regulate speed and availability.”
”Right, like intense traffic could be denied entrance to every other section to allow the next road to enter.”
”Yeah, with booms, and then the doors would also have to be telescopic to accommodate long trucks and buses.”
”And to save energy, the doors would rotate in the direction of that hemisphere’s Coriolis Effect.”
”So, northern cars would have to take a clockwise roundabout route.”
”Hmm, left-hand traffic there and drive on the right south of the equator? Man, this idea really sucks!”