From team press release:
TRINITY, N.C. (August 28, 2013) - NASCAR Sprint Cup Series driver Bobby Labonte is currently being treated at a local hospital near his home in Trinity, North Carolina after being involved in an accident while riding his bicycle near his home on the morning of Wednesday, August 28.
Labonte was transported to the hospital by ambulance where he was diagnosed and is being treated for three broken ribs. There are no other injuries. He is being held overnight for observation.
An update on Labonte's condition will be sent when determined. Mike Bliss will replace Labonte in the No. 51 Phoenix Racing entry this weekend in Atlanta.