Using the latest tech to glean a bird's-eye view of traffic and aid the advent of self-driving cars. When driving a car, you could really benefit from having a bird’s-eye view of the driving scene.

Recently, I purchased a couple of reprinted maps — one for my wife, and one for me. Hers was of Nantucket, where she still has relatives and worked for many summers. It now hangs over her desk. A ...