I understand that some larger cities will have this information available online. I recently took a roughly 900 mile (each way) drive with the family. I can see trying to look up this sort of information for the destination but I can't see trying to dig up statistics for every metro area between here and there where a little bladder might need to stop.

I guess sometimes it will be practical and other times it won't.
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"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt