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November 11, 2009 6:29 PM PST

By: Wayne Cunningham

Number 3

Navigation with traffic detouring
Navigation systems are great and have become very common. But they are much, much more useful when they can tell you about bad traffic jams ahead, and suggest a detour. Not only do they help you avoid the frustration of being caught in a parking lot on the freeway, these systems help your pocketbook and the environment, as they keep you from getting stuck in situations of wasteful idling while waiting for a car accident, or other obstructions, to be cleared.

Photo credit: Josh Miller/CNET

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