No cars to follow. No lane markings. Just a sheet of white with ditches on both side. Worse yet, no prior practice. Where you know the lanes are means little when the other cars are not respecting them. (As if lanes matter as nobody wants to drive that close together.) It isnt impossible but certainly a far more difficult problem than navigating an LA suburb.
If only there were some sort of magic sensor that could get you distance measures even if it's totally white outside. I don't know what such magic would be, but if you have it, it seems like you'd want that on all your cars, not matter how expensive. I'm no expert with electromagnetricity, however.
