I don't pretend to be an engineer, but was following the project closely. As far as I'm concerned, they screwed up. It'd need to be a really wide dual turn for cars to be able to get in on the inside lane but they could have made it work if it was planned from the outset. A dual turn configuration was "considered but rejected from a cost-benefit perspective" is what I was told when I asked in an email. Interchange will ultimately be this:
