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Pamela, you obviously need a good nav system for doing your job. Unfortunately, they do come up with poor route sellections at times. I know, it has happened to me with my StreetPilot III.
From what I gather the 06 Prius Nav will calculate three different routes based on some criteria that I cannot remember. (I pick up my Prius in about two weeks). You can then select the one you want to use. I do not know if the June issue for the 04 Prius will give the same options as the 06 but it should be better than what you have.
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