Rain could still be an issue at Dover:

While the forecast has improved dramatically throughout the weekend, rain could still impact Sunday’s race at Dover International Speedway. The‚ National Weather Service‚ forecast is: A chance of showers before 2pm, then a slight chance of rain after 2pm. Cloudy, with a high near 65. Breezy, with a northeast wind around 24 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
NASCAR_WXMAN‚ says on twitter, “SUN #NASCAR weather – I feel we race – Think we can get an “Official race” maybe even Full Race. Chc. of a shower or two. @MonsterMile”.
Dover does not have lights. The race is scheduled to go green at 2:45pm/et. Sunset is at 6:40pm/et.
(10-4-2015)