Eliminates the need for the cloverleafs.
This is for a road intersecting a freeway, where the people on the road have traffic lights. From the wiki, this design apparently reduces the amount of red light time, improving throughput of the intersection:
Additionally, the design can improve the efficiency of an interchange, as the lost time for various phases in the cycle can be redistributed as green time; there are only two clearance intervals (the time for traffic signals to change from green to yellow to red) instead of the six or more found in other interchange designs.