Mackinac Bridge Authority

Spanning the Straits of Mackinac since 1957

Why can’t over-dimensioned vehicles get a Mackinac Bridge permit?

Posted on December 6th, 2023

Heavy loads are escorted for a different reason than over-dimensioned loads. Heavy load escorts ensure weight is safely distributed on the bridge by following rules set forth by the MBA based on the recommendations of engineers throughout the life of the bridge. Over-sized loads are escorted to ensure the safety of all motorists on the bridge as they can impact other travel lanes. The MBA escorts alert motorists of over-dimensioned vehicles on the bridge and help drivers navigate around various obstacles on the bridge including lane closures, traffic cones, equipment, other motorists, and lane boundaries.

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