We purchased a Rand McNally Deluxe Motor Carriers Road Atlas. It has all the trucking routes for US, Canada and Mexico. It includes information on route restriction, low clearances and other useful information. We use it all the time. The next exit is a good resource as well. Its organized by state then interstate. Another option that we like better is "Exit Now". Exit Now provides the same information but is organized by interstate and you don't have to keep flipping through different states. For low clearances I have a few resources. I purchased a point of interest file of low clearances for the US from lowclearance.com. You install it on your GPS so it prompts you if you are coming near a low clearance within your specific limits, ie the height you set and distance away that you wish to be notified.
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