I have driven through one of these interchanges and did not find them to be much more efficient. In fact the first time can be confusing to a driver. And you need to know which lane to be in when making the crossover. The only advantage might be when you want to make that left turn onto a highway. If you are in that left lane, as many drivers are who just want to continue straight in what they think is the fastest lane, you will find yourself in an exit only lane onto the highway. There are few places where this type of design is really advantageous.