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.  Research and experience have shown that the Michigan Left relieves congestion; it increases safety by reducing the number and severity of crashes. Whenever MDOT plans work on a boulevard (divided roadway), engineers will consider incorporating Michigan Lefts.