Narrow bridges or bridges with weight limits.
I will soon be starting a six month tour of the US and Canada, and will be travelling in a Winnebago Sunstar which is quite big. While I will be on the major routes quite a lot, I also intend to take ...
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Rand McNally Motor Carriers' Road Atlas. All of the truckers' routes in each State are clearly marked and there is a listing of low overpasses by State in the front of the book. If a loaded 18-wheeler can travel on it then you probably can as well. It has always worked for us so far.
