Date: 202002
Local time of day: 0601-1200
Location: BOW.Airport, FL
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: Small Aircraft; High Wing; 1 Eng; Fixed Gear
Operator: Personal
Operating under: Part 91
Flight plan: None
Mission: Personal
Flight phase: Taxi
ATC / advisory: Ground BOW
Reporter organization: Personal
Reporter function: Pilot Flying; Single Pilot
Reporter qualification: Flight Crew Private
Human factors: Situational Awareness; Confusion
Anomaly: ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Detector: Person Flight Crew
When detected: Taxi
Result: Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification
Contributing factors: Airport
Primary problem: Airport

Narrative: After landing on Runway 5 I was instructed to turn left on Taxiway A2 and hold short of Runway 9L; which I understood and read back. A2 comes out of an intersection which is a little confusing on its own with 5 spokes - it's an intersection of Runway 5 and an abandoned runway nearly perpendicular (which isn't well marked on the ground) with Taxiway A2 coming out of the north part of the X. Once I positively identified A2 and started taxiing on it I saw two sets of runway hold short lines within about 40 feet of each other. Naturally my first thought was I needed to clear the active runway I was on; then hold short of the next set of lines marking the next runway.Unfortunately; in this case they were reversed - the first set was to hold short of 9L and the next set was one for traffic coming from opposite direction to hold short of runway I was coming from. Essentially; there is no area where you are clear of both runways - you are either clear of one or of the other. As I crossed the first set; I made a comment to Tower about how small this holding area was; at which point he of course told me to stop; which I already was since I got to the place I thought I needed to be; between the two sets of lines. Obviously as I looked out of the side window it was clear that I made a mistake; so I apologized and no action was taken.Safety was never in question in this case since I could clearly see the actual runway I needed to be clear of which was still about 130 feet away; but technically I did cross the hold short line so that pretty much makes it a runway incursion. I review this kind of stuff all the time and I can recite you all the airport markings. If you gave me this question on a quiz I'm sure I would answer it right; while sitting in a comfy chair at home. But in this case expectation bias and a confusing intersection; especially after getting beat up in the pattern for an hour on a windy day ended up leading to this mistake.I've actually been flying out of this airport for a couple of years; and this intersection has confused me in the past; again because of the abandoned runway; it's just with normal operations I don't get go through it very often; but even being ready for it; it takes some time to figure out which is a taxiway and which is the abandoned runway. I think some better markings on ground; or even some traffic cones would help. As far as the hold short lines I think it would be more clear if they were combined; instead of having an area in between; but I think the fact that connector taxiway is reasonably short; runway safety areas overlap so it may not be possible.




Synopsis: General aviation pilot reported the placement of hold short lines on Taxiway A2 for runways 5 and 9L at BOW airport are reversed; causing aircraft to cross the hold short lines of Runway 9L in order to clear Runway 5 on the taxiway side of the lines.