It's warmer than usual at Martinsville Speedway, and that means trouble for Sprint Cup drivers.
And this isn't a race for track trouble. After the green flag fell at 1:13 p.m. ET, Sunday brought 500 laps on a track that is as unique as it is historic.
MORE: Jeff Gordon, Tony Stewart one more time | Dale Earnhardt Jr. plans 2017 return
A hot track means grip will be a problem, and nowhere will grip be more critical than in the turns. Martinsville, a NASCAR track since 1949, is a true throwback at 0.