Snapshot: Martinsville

RELATED: Full schedule for Martinsville At a Glance What: First Data 500 Where: Martinsville Speedway, .526-mile oval Green flag: 3:13 p.m. ET TV/Radio: NBCSN, MRN, SiriusXM NASCAR Radio Forecast: Showers likely early then mostly cloudy with a high temperature of 52 degrees, according to the National Weather Service. Chance of precipitation 70 percent, with northwest winds 8 to 14 mph. National anthem: The Gaither Vocal Band. Grand Marshals: Frank Bisignano, First Data CEO and Chairman. Race distance: 500 laps, 263 miles Pit road speed: 30 mph Caution car speed: 35 mph Competition caution: Lap 45 Stage lengths: Stage 1 ends on Lap 130. Stage 2 ends on Lap 260. Final stage is scheduled to end on Lap 500.