The new interchange will eliminate loop ramps, a design from вЂњway back whenвЂќ that are challenging for drivers, especially in the winter months when the ramps are snowy and icy. An operational and safety analysis found that the DDI is вЂњthe preferred alternative and the best option from a capacity safety and efficiency perspective.вЂќ Federal officials approved the findings and decision to replace the interchange with the new efficient design, Morosi says. The city asked MDOT to evaluate a DDI at this location primarily because the existing interchange really has an outdated design problem and peak hour congestion. There are DDIs along I-75 at 14 Mile and Big Beaver Roads in Troy and at University Drive in Auburn Hills. Right-hand turns are handled the same way at both a DDI and a diamond interchange, but it differs in how left turns are handled. ItвЂ™s similar to a conventional diamond interchange, the most common type in the United States where the exit/entrance ramps make a diamond shape between the freeway and surface street. вЂњThey asked us to evaluate a DDI (diverging diamond interchange) at this location primarily because the existing interchange really has an outdated design problem and peak hour congestion.вЂќДЄ diverging diamond interchange is a type of interchange design that aims to improve safety and mobility. Morosi says the ramps are outdated and add unnecessary slowdowns entering and exiting the freeway. Proposed I-75/12 mile diverging diamond interchange MDOT spokesperson Rob Morosi says the department was approached by the county, which has jurisdiction over 12 Mile, to evaluate the interchanges. The Michigan Department of Transportation says roads will close and traffic will be interrupted, but the project should be completed by the end of the year. Madison Heights will see orange barrels headed to the area for a new interchange at 12 Mile. If youвЂ™ve traveled along Interstate 75 anytime in the past year, youвЂ™ve probably experienced traffic delays because of construction.

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