An essay by Mark Stairwalt. Years ago, before the coming of the cell phone, I was the driver of a Freightliner FLD 120, an imposing, long-nosed boat of a semi tractor that crisscrossed the United States and parts of Canada with a 53-foot trailer in tow. Never mind that as a driver of a commercial vehicle one ends up memorizing the locations of countless truckstops, customers, scale houses, steep grades, and unlikely parking spots; what was truly impressive back then was that drivers would end up cataloging the locations of every accessible payphone along every route in every state we frequented.