Narrative:

Called for taxi. Ground controller told us to turn at taxiway a to runway 22R. I was taxiing slowly and looking for signs. At a glance I picked taxiway a signs which were in the middle of a whole bunch of other yellow and black taxiway signs. I should have made a 90 degree turn onto taxiway a but there was also taxiway K which was right at entry point of taxiway a except it was more like a 120 degree turn. I turned onto taxiway K by mistake simply because it came up first. Also it was hard to know the difference between a turn that's 90 degrees or 120 degrees in the fog. As soon as I realized we deviated from clearance, I had the first officer call the ground controller and tell them where we are, and we are correcting. Total lost time was about 20 seconds, enough to end up in the middle of runway 1/19. Runway 1/19 was not active and we had clearance to cross it. We ended up taxiing on runway 1/19 for about 50 ft and made ground controller aware of that. There was no traffic conflict between us and other taxiing, taking off, or landing traffic. The first officer was busy figuring out the power and airspeed data. The company makes us do that while taxiing. Had the first officer been looking outside, she might have caught the mistake. At the turning point I was looking in and out to adjust altimeter, airspeed bug and power, etc. Supplemental information from acn 356909: I, as the first officer, should have paid more attention during taxi with low visibility, especially close to the runway.

Related reports:

Google
 

Original NASA ASRS Text

Title: UNAUTH RWY OP TAXI OP WHEN COMMUTER PIC MAKES A WRONG TURN ON A TXWY AND GETS ONTO A RWY HE WAS CLRED ONLY TO CROSS. VISIBILITY REDUCED, WX FACTORS. TERMINAL AREA WX.

Narrative: CALLED FOR TAXI. GND CTLR TOLD US TO TURN AT TXWY A TO RWY 22R. I WAS TAXIING SLOWLY AND LOOKING FOR SIGNS. AT A GLANCE I PICKED TXWY A SIGNS WHICH WERE IN THE MIDDLE OF A WHOLE BUNCH OF OTHER YELLOW AND BLACK TXWY SIGNS. I SHOULD HAVE MADE A 90 DEG TURN ONTO TXWY A BUT THERE WAS ALSO TXWY K WHICH WAS RIGHT AT ENTRY POINT OF TXWY A EXCEPT IT WAS MORE LIKE A 120 DEG TURN. I TURNED ONTO TXWY K BY MISTAKE SIMPLY BECAUSE IT CAME UP FIRST. ALSO IT WAS HARD TO KNOW THE DIFFERENCE BTWN A TURN THAT'S 90 DEGS OR 120 DEGS IN THE FOG. AS SOON AS I REALIZED WE DEVIATED FROM CLRNC, I HAD THE FO CALL THE GND CTLR AND TELL THEM WHERE WE ARE, AND WE ARE CORRECTING. TOTAL LOST TIME WAS ABOUT 20 SECONDS, ENOUGH TO END UP IN THE MIDDLE OF RWY 1/19. RWY 1/19 WAS NOT ACTIVE AND WE HAD CLRNC TO CROSS IT. WE ENDED UP TAXIING ON RWY 1/19 FOR ABOUT 50 FT AND MADE GND CTLR AWARE OF THAT. THERE WAS NO TFC CONFLICT BTWN US AND OTHER TAXIING, TAKING OFF, OR LNDG TFC. THE FO WAS BUSY FIGURING OUT THE PWR AND AIRSPD DATA. THE COMPANY MAKES US DO THAT WHILE TAXIING. HAD THE FO BEEN LOOKING OUTSIDE, SHE MIGHT HAVE CAUGHT THE MISTAKE. AT THE TURNING POINT I WAS LOOKING IN AND OUT TO ADJUST ALTIMETER, AIRSPD BUG AND PWR, ETC. SUPPLEMENTAL INFO FROM ACN 356909: I, AS THE FO, SHOULD HAVE PAID MORE ATTN DURING TAXI WITH LOW VISIBILITY, ESPECIALLY CLOSE TO THE RWY.

Data retrieved from NASA's ASRS site as of July 2007 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.