Narrative:

I was departing runway 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.

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Original NASA ASRS Text

Title: Pilot reported a runway incursion by a ground vehicle during takeoff roll.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.