According to a statement released by Roush Racing, the 60-year-old suffered closed head injuries but was following commands from his attending physician on Saturday.
The statement also said Roush sustained minor chest and internal injuries. Roush also broke both legs, which were expected to be set Saturday.
After the crash, which came on his birthday, Roush was airlifted by helicopter to the University of Alabama Birmingham Medical Center, where he arrived Friday at 11 p.m. EDT.
WBMA-TV in Birmingham said Roush's plane went down about 6 p.m. EDT in a residential area and was submerged in water for about five minutes after the crash. The report said he was the only one aboard the plane and was pulled from the wreckage by someone who lives near the crash site.
Smith said the plane was a twin-engined experimental "Aircam," not Roush's P-51 Mustang World War II fighter plane.