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Before I begin a trip in my automobile, I always ask my windshield-mounted GPS navigation device to plot a course. The navigation device has some useful options. I can choose the fastest route, the shortest route, the route that takes me onto no freeways or the safest route. Funny thing, though. Whenever I choose the safest route, the on-screen map shows only a short blue line leading to the end of the driveway and back into the garage. A little mechanical voice says, "You've already arrived at your destination."