The Iowa State Patrol says a Humboldt man was killed in a single car accident in Badger Wednesday morning. 90 year-old Joseph Colwell was driving northbound on County Road P-59 at 10:14am under heavy fog when he failed to negotiate the t-intersection at 2nd Avenue SE. The vehicle left the road and struck a parked semi-trailer in an adjacent lot. Colwell, who was wearing a safety belt, was pronounced dead at the scene. Multiple departments, including the Webster County Sheriff's Office, Badger Fire Department, and UnityPoint Trinity Regional Medical Center ambulance responded to the scene. The Iowa State Patrol continues to investigate the crash.