[osidak]

They are popping up every where around here. They make zero sense

You take something from full duplex (traffic flowing in both directions and now drop it to half duplex. Only one side of traffic on the bridge can move at any one time.

They also throw some pretty swift curves into the intersections. I have always been annoyed by people not keeping their cars between the lines. In these intersections nearly everyone is crossing over their lines

The longest one in use here that I am aware of has been in place about a year. That intersection had moderate traffic issues before. Now there is heavy traffic on a daily basis