Not neccesarily so to encounter a long delay into Michigan, if you enter at Sarnia-Port Huron crossing. I would never even consider a Detroit-Windsor crossing on a wknd, unless you like long delays and manic customs inspectors.
Furthermore, if he crosses at SSM, and heads counter-clockwise, he won't even be crossing Mackinaw Bridge and would instead be heading across the dunes of the Upper Michigan Peninsula and across to Wisconsin. I'm struggling to follow your logic.
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