Any Unknown or Unlisted Aircraft Manufacturer
Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Instrument
Communication Breakdown; Confusion
Conflict Ground Conflict; Critical; Ground Event / Encounter Vehicle; Ground Incursion Runway
Flight Crew Took Evasive Action
Airport; Procedure; Human Factors
I was departing RWY 31 out of ONL; I made at least two calls on CTAF before taking the runway stating my intentions. As I lined up on the runway; I noticed several vehicles working at the far end of the field on both sides of the runway but they were all well clear of the safety area. Shortly after I started my takeoff roll; I noticed a large pickup truck pulling a trailer approach the runway at the far end. As I had made radio calls and was currently moving at about 80 kts in the opposite direction; I thought he was going to hold short; let me pass and then take the runway. He did not hold short. He did not even pause before taking an active runway; and ended up nose to nose with a rotating [aircraft]. It was unseasonably cool due to the passage of a recent storm so I was able to climb very quickly above him. Still; I would estimate the distance between us to be about 200 feet when I crossed over.What caused this event was the truck driver's lack of knowledge and experience with airport operations. I never heard any calls from him when he took the runway so it is a fairly safe assumption that he did not have a radio and did not hear my calls. Also a quick visual check to make sure the runway was clear in both directions as is standard practice could have prevented this.[I responded to the incursion by climbing] at VX and [hoping] I clear him.Train people who intend to operate on an airfield proper see and avoid techniques and have them monitor CTAF.
Pilot reported a runway incursion by a ground vehicle during takeoff roll.