Yesterday, Google launched a beta feature called "walking directions" on Google Maps. While the directions are limited to routes shorter than 6.2 miles (or 10 kilometers), they provide a few useful advantages for walkers over regular driving directions. First, the walking directions ignore the direction of one-way streets. Second, it supposedly takes into account terrain, giving pedestrians a more flat and walkable route when possible. Google acknowledges that the feature is clearly in beta, even adding this warning: "Use...