Narrative:

Aircraft X; a CRJ9; was taxied from the gate to runway 10L via taxiway alpha for departure. As they were approaching the approach end of the runway; I cleared them for take off; but they continued past the approach end of the runway onto taxiway juliet and inadvertently crossed the runway 10L approach and taxiway zulu (which also leads back to runway 10L). It was at this time that I noticed they were not at the correct position and canceled their takeoff clearance and had them hold short of runway 10R. I didn't advise them that they had possibly committed a pilot deviation; although it occurs now that this may have been the correct course of action on my part. While they were performing a numbers check to see if they could depart 10R; I was being relieved and advised the incoming controller of what had just occurred. This event happened because of a confusing taxiway layout. This has been identified in several rsat meetings and there is even a hot spot attributed to the layout at that location. Recommendation; as stated above; the lay out is confusing to pilots and until a taxiway is removed or the layout is changed in some way; this will continue to happen. I would recommend removing any alternative routing to get to runway 10L. I realize that this may create an extended taxi for aircraft attempting to get from the north side of the airport to runway 10R; but if safety is our first priority then we must remove taxiway juliet between taxiway alpha and runway 10R.

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Original NASA ASRS Text

Title: BOI Controller described a runway crossing event when clearing an Air Carrier taxiing to Runway 10L for take off only to observe the aircraft cross over to Runway 10R.

Narrative: Aircraft X; a CRJ9; was taxied from the gate to Runway 10L via taxiway Alpha for departure. As they were approaching the approach end of the runway; I cleared them for take off; but they continued past the approach end of the runway onto Taxiway Juliet and inadvertently crossed the Runway 10L approach and Taxiway Zulu (which also leads back to Runway 10L). It was at this time that I noticed they were not at the correct position and canceled their takeoff clearance and had them hold short of Runway 10R. I didn't advise them that they had possibly committed a pilot deviation; although it occurs now that this may have been the correct course of action on my part. While they were performing a numbers check to see if they could depart 10R; I was being relieved and advised the incoming controller of what had just occurred. This event happened because of a confusing taxiway layout. This has been identified in several RSAT meetings and there is even a hot spot attributed to the layout at that location. Recommendation; as stated above; the lay out is confusing to pilots and until a taxiway is removed or the layout is changed in some way; this will continue to happen. I would recommend removing any alternative routing to get to Runway 10L. I realize that this may create an extended taxi for aircraft attempting to get from the North side of the airport to Runway 10R; but if safety is our first priority then we must remove taxiway Juliet between taxiway Alpha and Runway 10R.

Data retrieved from NASA's ASRS site as of April 2012 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.