Veteran driver Bobby Allison was listed in critical but stable condition today after being knocked unconscious with multiple injuries from a first-lap accident in the NASCAR Miller 500.

Allison, 50, of Hueytown, Ala., was taken to the Lehigh Valley Hospital Center on Sunday suffering a concussion, fractured left leg, trauma and possibly internal bleeding, track officials said. He had to be pried out of his car.Hours after the accident, Allison remained unconscious in critical but stable condition, hospital spokesman Rob Stevens said.

Allison's son, Davey, continued the Father's Day race but kept in touch with his pit crew by radio to learn more about his father's condition.

The accident occurred on the second turn of the first lap on the 21/2-mile oval at Pocono International Raceway.