"The Thin Checkered Line" is the fourth installment in the Behind the Wheel series - a week in the life of a San Francisco taxi driver living in Oakland, a newly minted father and newspaper columnist who's always on the prowl for a good ride and an even better story ...Over the course of these five narrative essays, I document the gritty details of the 12-hour taxi shift while exploring the rapidly changing landscape of present day San Francisco; .As I attempt to explain how the taxi system works, I answer the eternal question: why I drive a taxi, and describe what it's like driving a taxi in the age of Uber and Lyft ...Along the way, I also speculate on the future of transportation and wonder where the hell we're going, and whether or not the destination is meter and a half ...