Taking a road trip? You may know where you're going and how you want to get there. The real question is -- when is the best time to leave? CBS News travel editor Peter Greenberg discusses new features on navigation apps.

(Illustration by Getty Images)

<p>Taking a road trip? You may know where you're going and how you want to get there. The real question is -- when is the best time to leave? CBS News travel editor Peter Greenberg discusses new features on navigation apps.</p>
<p>(Illustration by Getty Images)</p>

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