NBC's live coverage of the Brickyard 400 NASCAR race held on Sunday was watched by 21 million US viewers, an audience of over one million more than the previous year's record ratings for the event.
This year's Brickyard 400, which was held at the Indianapolis Motor Speedway, also produced the race's largest ever national rating with NBC's broadcast producing a 6.3 household rating and a 16% audience share, a rise of 2 percent% on the previous year.
US free-to-air network NBC registered record ratings for its latest broadcast of the NASCAR motor racing series at the weekend.
