Authorities said the crash happened at the intersection with Lake Wheeler Road. A witness driving by around 8:41 a.m. called police after seeing the man lying in a ditch.
Troopers said the man's injuries are possibly life-threatening.
The 58-year-old man was taken to WakeMed. His name was not released.
The road was closed for an hour on Saturday morning.
Authorities do not have a description of the suspect vehicle.
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