DOVER -- Horsepower is thundering around Dover International Speedway as NASCAR's triple-header weekend of racing gets underway.
XFINITY and Sprint Cup cars were on the track Friday morning for practice sessions. The Camping World Truck Series qualifying is set for Friday afternoon with the race scheduled to begin at 5:30 p.m.
For ticket information and a complete schedule on all three races, go to Dover International Speedway's website.
And come back here throughout the day to see additional photographs.