The Wapello County Sheriff TMs Department is investigating a possible suicide attempt.
The accident occurred Thursday afternoon around 12:42 near the intersection of Highway 149 and 63.
Witnesses said a man driving a red Chevy Cavalier walked into the road just ahead of an approaching semi truck.
Wapello Deputy Sheriff Chris Shadduck said the man was hit and sustained minor injuries.
The man was transported to the Ottumwa Regional Health Center.