The Michigan Left was developed to avoid the interlocking left-turn movements along divided highways. In this way, the only turning movements allowed at such an intersection are right-hand turns. Traffic lights can be placed at busier Michigan Left intersections if warranted. For the most heavily-used "crossovers," specialized traffic signals may be placed to ensure traffic does not back up on the highway waiting to turn left.This reminds me of the return of the roundabout (for example, Hwy 13 and Co. Rd. 2 in Scott County).
mn: The Michigan Left vs. the Traffic Circle
Check out this discussion on mnspeak.com, about the "Michigan Left":