AP photo by Brynn Anderson / NASCAR official Kirk Price kneels while saluting the flag during the national anthem before Sunday's Cup Series race at Atlanta Motor Speedway in Hampton, Ga. NASCAR paused before the race to acknowledge the country's social unrest in relation to the death of George Floyd at the hands of police on May 25 in Minneapolis.

HAMPTON, Ga. — Bubba Wallace donned a black T-shirt with the words "I CAN'T BREATHE" and "Black Lives Matter," and NASCAR paused before Sunday's Cup Series race at Atlanta Motor Speedway to acknowledge the country's social unrest.

The stock car racing giant also vowed to to do a better job of addressing racial injustice in the wake of George Floyd's death on May 25 at the hands of police in Minneapolis. During their warmup laps, the 40 cars pulled to a stop in front of the empty grandstands and shut off their engines so NASCAR president Steve Phelps could deliver a message over their radios.

"Thank you for your time," Phelps said. "Our country is in pain and people are justifiably angry, demanding to be heard. The black community and all people of color have suffered in our country, and it has taken far too long for us to hear their demands for change. Our sport must do better. Our country must do better."

A black NASCAR official took a knee along pit road, using a gesture employed by protesters in tribute to former NFL quarterback Colin Kaepernick. All 40 crews stood on the wall in front of their pit boxes.

"The time is now to listen, to understand and to stand against racism and racial injustice," Phelps said. "We ask our drivers ... and all our fans to join us in this mission, to take a moment of reflection, to acknowledge that we must do better as a sport and join us as we now pause and take a moment to listen."

Wallace, the only African American driver in NASCAR's top-tier Cup series, has been the sport's most outspoken voice since Floyd's death that has sparked massive protests in all 50 states and around the world demanding an end to law enforcement brutality against people of color.

The T-shirt worn by Wallace, who drives for Richard Petty Motorsports, carried Floyd's pleading words when an officer, identified as Derek Chauvin, pinned a knee on his neck for more than eight minutes while he was handcuffed. Chauvin and three other officers have been fired and charged in the incident, which followed the deaths of Breonna Taylor and Ahmaud Arbery.

Protesters have cited all three African American victims in their demands for social justice.

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AP photo by Brynn Anderson / NASCAR driver Bubba Wallace wears a Black Lives Matter shirt before Sunday's Cup Series race at Atlanta Motor Speedway in Hampton, Ga. Wallace, who drives for Richard Petty Motorsports, is the only African American currently competing in the top-tier series on a regular basis.

After Phelps spoke to the NASCAR drivers, they observed a 30-second moment of silence. Then, as the cars refired their engines and slowly pulled away for the green flag, the Fox broadcast cut to a video made by a number of Cup Series drivers, including Wallace and Hendrick Motorsports veteran Jimmie Johnson, as well as retired star Dale Earnhardt Jr., a longtime most popular driver award winner and the son of the late NASCAR legend whose seven season championships tied a record set by Petty that has since been matched by Johnson.

Several drivers also posted the video on their Twitter accounts, vowing to "listen and learn" from the protests that have rocked the nation. They vowed to "no longer be silent" and pledged to "work together to make real change."

With its roots in the South and a former embrace of Confederate symbols, NASCAR has a checkered racial history. The organization has launched diversity programs but still struggles to shake its reputation as a largely white sport. During a shutdown caused by the coronavirus pandemic, Cup Series driver Kyle Larson was fired by Chip Ganassi Racing after casually uttering a racial slur while competing in a virtual race.

"We need step up more than we ever have before," said retired star Jeff Gordon, a four-time Cup Series champion who is now a Fox broadcaster. "We are listening, we are learning and we are ready to change."