Joey Logano was running inside the top five late in the race when he connected with Morgan Shepherd. The 72-year-old Shepherd, who extended his mark as the oldest driver to start a race in NASCAR's Sprint Cup series, was about 15 laps down when his No. 33 slid up into Logano.
"I feel like there should be a driver's test before you get out in a Cup car and make sure you know how to drive before you drive one," Logano said.
Shepherd was 39th and completed 278 laps. He was never warned about not meeting the minimum speed of 115.875 mph.
"It's an accident. Those things happen," NASCAR vice president of competition Robin Pemberton said. "It could happen to anybody. It could happen with any competitor."
Johnson, the six-time NASCAR champion, was knocked out of the race early after two rear left tire issues. The first time the tire was flat; the second time, the tire exploded and slammed the No. 48 Chevrolet into the fence. He finished 42nd.
Goodyear said the tires weren't the problem.
"The tires failed in a manner consistent of low inflation pressure," Greg Stucker, Goodyear's director of racing, said.
Four fully functioning tires might not have helped even Johnson catch Keselowski.
"I think we have a lot of potential still left in our team," he said.