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My guess is that it is as The Ohio TPk as do others charge by axle and weight. It no doubt has something to do with weight limits like on bridges and some roads but with a RV don't think we need to worry about 18 wheeler weights. You need to fudge a bit because we are not really a 18 wheeler and are not as long or weigh as much but when you plug in your numbers it hears you. I also like that it warns you of the proper lane to be in or stay out of in advance.
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