FILE - In this July 5, 2014, file photo, Tony Stewart walks down the runway during driver introductions before a NASCAR Sprint Cup Series auto race at the Daytona International Speedway in Daytona Beach, Fla. Racing sprint cars is Stewart's passion. But now his hobby, racing on tiny little tracks in nondescript towns outside of a busy NASCAR schedule, is again being called into question. The three-time NASCAR champion struck and killed a 20-year-old racer who had climbed from his car Saturday, Aug. 9, to confront Stewart on a New York dirt track following a crash caused by contact between the two cars. (AP Photo/Phelan M. Ebenhack, File)
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