Join Date: Apr 2009
Location: Tulsa, OK
Bikes: Raleigh Sojourn, Trek X-Caliber, Trek Antelope
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My experience with Google maps bike routes is that they are usually pretty good. I prefer no shoulder and low traffic to a wide shoulder and high traffic, largely because I really hate traffic noise. Check out the satellite photos and street-view; that should give you an idea of the shoulder. Also see if the states you are going through publish traffic counts for the highways. Generally, an AADT of less than 1000 is very good. Google will also put you on dirt roads sometimes. This is something else to check on the satellite; consider whether or not you want to ride on dirt/gravel roads with the bike (and tires) you are taking, and if you do plan to ride on dirt roads, check the weather forecast for rain.
Another suggestion: it's really effing hot right now. You might think about going north and/or taking this trip in the fall. If you do tour in the South this summer, make sure you have plenty of water, and have some electrolyte tablets on you just in case. I just rode Tulsa-Dallas, and went through 6 liters of water in the 25 miles between Hugo and Paris. That gives you an idea of how much you need to carry.