Well, It has traffic info so, if you live in a big enough area to have to choose one highway over another at a certain time of day it should also be big enough to RTTI.
As far wanting to take one highway over another just because, you should be able to pan out until you see the highway you want then pick it or something near by it as your destination. Once you get there put in your original destination.
It gives you options of, dynamic route (changes you route according to RTTI), quick route, and a few other options.
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