If the point was the reduce the flow, why wouldn't you make a roundabout?
story: An out of state tech visiting our job site greeted us with "What the hell is wrong with the traffic lights in Florida!?" This was SW FL and I was a little confused because he had driven thru one of the most benign counties. I might be conditioned though.
Just north of Tampa is a county where most traffic lights are timed to insure you reach the next one on the yellow. I've traveled thru it regularly for 30 years. Between 20 and 15 years ago it reached ~as bad as possible status and there it remains.
Adding awful to bad are the drivers who've realized they can defeat much of this timing with sufficient speed.
Roundabouts have far higher throughput than junctions with traffic lights.