NASCAR's changes get 1.5-mile test in Las Vegas

Dale Earnhardt Jr. puts on his helmet during qualifying for Sunday's NASCAR Sprint Cup Series auto race on Friday, March 7, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

Dale Earnhardt Jr. puts on his helmet during qualifying for Sunday's NASCAR Sprint Cup Series auto race on Friday, March 7, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

More Photo Galleries

Happening Now