I am in Maryland and a lot of the highways have gone to these type of intersections where they have to have at-grade (can't build a traditional cloverleaf overpass). It works fine as long as the driver knows how to, and has a vehicle capable of, speeding up the acceleration lane, merge / cross the two lanes to the center turn lane and then make the u-turn and merge back across the other 2 lanes.....in short, that is a whole lot of merging, accelerating and decelerating all in a short space of road -- too many drivers around here screw up one or more portions of the whole routine.....fail to speed up enough and then just cross both lanes blindly to the u-turn lane with cars braking / swerving wildly around them to avoid hitting them in the 30MPH speed difference....But I will say that on a busy highway with 35 feet of TT behind me I find it better than a straight across intersection because you only have to clear on half of the cross traveling lanes at a time, rather than having to wait for breaks in traffic from both the right and left because the TT is too long to pause in the median....Around here, you will sit and wait long time to have a break from both sides for long rig to make it across.
