George Thrasher has learned not to ask too many questions. Like when a man slides into the back of his taxicab and rattles off a list of addresses. The instructions are usually the same: Drive to the ...

NEW YORK—It all started with a tweet. "It's #metricmonday again! Today's #infographic shows data on yellow taxis on the road by day and time. #nyctaxi," tweeted the Taxi and Limousine Commission (TLC) ...