Irecently got stuck behind a big, slow-moving sedan that kept weaving tentatively toward the curbas if the driver was looking for an address -- or was about to nod off.Of course I assumedthe driver was elderly, perhaps someone who should consider hanging up the keys.

Many of us make such snap judgments every day based on the belief that older driverswhose eyesight, hearing and other senses are could be diminished, are rolling road hazards. We hearstories about octogenarians driving through store windows, running down people...