Side note, they actually opened one last year about a half hour away from me. MANY people complained about it during the planning and construction phase. But when it opened, traffic died down, and all of the sudden no one complained anymore. Same thing with a roundabout a couple years back.
It'll probably become more popular once people realize the benefits of it and stop being scared of a new idea.
Edit: Here's the video of the one by me. Very similar to
@danlb_2000's video, but it features first person views which show how odd it looks.