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NASCAR driver Clint Bowyer also included the hashtag “LEFturn” in a tweet, saying: “So sad to hear about Jason Leffler. Was a wheel man and a fun fun person to be around.”

Many drivers also mentioned Charlie Dean in their tweets. A single father, Leffler was devoted to his son and his Instagram account was full of photos of the two spending time together, including many at race tracks.

“Praying for all of Jason Leffler family, especially his little guy Charlie,” tweeted IndyCar driver Ed Carpenter.

A little over two weeks ago, 22-year-old driver Josh Burton died of injuries sustained in a crash at Bloomington Speedway in Indiana. In late May at a dirt track in Nevada, two drivers were killed in a race. In March in California, two people were killed when a car careened off a dirt track and crashed on pit road.

Sprint car races can be more dangerous for drivers and spectators because the safety measures taken by series aren’t at the same level. Many facilities lack the SAFER barriers that are standard in NASCAR and IndyCar, and the cars aren’t always adequately protected.