AP photo by Matt Slocum / Members of NASCAR driver Christopher Bell's crew push his No. 95 Toyota Camry through the garage area before a Cup Series event at Pocono Raceway on June 27 in Long Pond, Pa.

Updated at 4:15 p.m. on Sept. 4, 2020, with more information and to correct that a driver who tests positive for COVID-19 could potentially advance in the playoffs. An earlier version of this story said a positive test would end a driver's championship bid due to a lack of points from missing a race.

CHARLOTTE, N.C. — NASCAR has decided it will not grant COVID-19 relief during the Cup Series postseason, meaning a positive coronavirus test could end a driver's bid for the 2020 championship.

The playoffs begin Sunday at Darlington Raceway in South Carolina without a safety net for the 16 participants during the pandemic. It's up to each driver to protect himself from COVID-19, understanding there is no cushion for missing a race.

"I'm probably not going to go to college and hit up a keg stand," Stewart-Haas Racing's Clint Bowyer said. "If you have COVID, you can't race. It's not a judgment call."

NASCAR at its discretion grants waivers for illness, emergency or personal reasons. The waiver maintains playoff eligibility, if the driver qualifies, but no points are awarded while sidelined. A waiver during the playoffs would allow the driver to return once medically cleared, but he would have lost valuable points needed to advance into the next round.

There are scenarios in which missing a race would not cripple a driver's title chances. Kevin Harvick, for example, accumulated enough bonus points during the regular season to ensure he should advance for several rounds. A driver could also return from missing a race, win an event during that round and earn an automatic advancement into the next round.

Austin Dillon and Jimmie Johnson both missed one race during the season after a positive COVID-19 test and earned zero points. Dillon won a race — worth an automatic berth in the playoffs — but Johnson, the seven-time Cup Series champ, went winless and missed the cut by six points.

NASCAR made no changes to its health and safety protocol for the 10-race playoff series, so missing an event would would effectively end a driver's chances.

"If a driver tests positive, that driver needs to have two negative tests in a 24-hour period, or a 10-day period. We are not going to change those rules," NASCAR president Steve Phelps said.

As one of the first major sports to resume competition during the pandemic, NASCAR put in place guidelines designed to limit both exposure to the virus and its spread. Infield access has been closed to all but essential personnel, and events have been held with both limited spectators and empty grandstands.

NASCAR does not test for the coronavirus and is trusting its participants. Dillon and Johnson took tests of their own accord.

"If you look at the success that we've had to date, the protocols are working very well," Phelps said. "Is everything perfect and foolproof? It's not. But for us, we've been pleased with how it's gone thus far."

SHR's Harvick won the regular-season title and is the top seed in the playoffs with seven victories. The pandemic has already led to radical changes in his lifestyle that have been bolstered now that the postseason is here.

He kept his 8-year-old son home from school this semester, and the Harvick family has eliminated all social events. They don't even go to the grocery store, he said.

"I travel by myself. I drive in the rental car by myself. I go to the motorhome by myself. I get back in the rental car, and I go home," Harvick said. "It's touched pretty much every portion of our life, trying to create an environment to be as safe as possible."

NASCAR until 2004 crowned its champion via a season-long points system that penalized drivers for missing races. It forced competitors to drive injured — Ricky Rudd once infamously taped his eyelids open to drive, and Dale Earnhardt Jr. hid concussions — and the waiver system was ultimately implemented.

The waiver helped reigning Cup Series champion Kyle Busch in his first title campaign when he missed 11 races during the 2015 regular season with a broken leg and broken ankle. He won four times to race his way into the playoffs, then secured the title.

A serious injury would obviously take a driver out of contention, but the coronavirus is not as clear cut and drivers could theoretically not be tested to protect their season. Johnson was not suffering symptoms but was tested after his wife received a positive test; Dillon was experiencing mild symptoms. Both were cleared to return in less than a week.

"I've talked to both of them that had it, and (they've) probably had worse hangovers," Bowyer said.

Team Penske's Joey Logano dismissed the idea of deliberately not being tested out of fear of missing a race.

"Our safety needs to be the utmost concern, not just for ourselves, but in a selfless way we need to be smart about testing," Logano said. "We also need to be smart about who we see and how we do things. As the world is starting to open up slowly, I think for these 10 weeks I probably still need to be smart about it because my season is on the line."