Narrative:

We were cleared to taxi to the bravo hold point, for departure on runway 9. We were subsequently cleared (from the bravo hold point) to taxi to runway 9 via taxiway B and S-1. I proceeded to taxi along taxiway B, trying to pay particular attention to the crossing of the extended ctrlines of runways 9 and 4L (since I was well aware, from previous experience, how poorly the cross-txwys are marked along this route -- they are not marked at all). I had already briefed that we would need to be especially vigilant due to the blowing snow and lack of cross-taxiway markings. We both had the airport diagram in front of us and both monitored the taxi progress. Nevertheless, when I turned left onto what I thought was taxiway S-1, we immediately discovered that we had passed up taxiway S-1 and had instead turned onto taxiway south. This taxiway also leads to the threshold of runway 9, merging with taxiway S-1 at the threshold. There was therefore no danger, nor conflict. We did, however, taxi via a route other than which we were cleared. Contributing to this mistake, I believe, were 3 factors: 1) even though there was no precipitation at the time of occurrence, the strong wind and snow blowing across the txwys,when combined with night conditions, significantly restr pavement surface visibility. 2) residual deicing fluid on the surface of the left, side cockpit window restr visibility to the left. And 3) the most significant contributing factor is the lack of cross-taxiway markings for both taxiway S1 and taxiway south. In retrospect, I should have had the side window wiped clear, but all else, with regard to my actions, was exactly as I believe it should have been. These particular txwys should be better marked.

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Original NASA ASRS Text

Title: AN ACR MLG MISSED A TURN WHILE TAXIING.

Narrative: WE WERE CLRED TO TAXI TO THE BRAVO HOLD POINT, FOR DEP ON RWY 9. WE WERE SUBSEQUENTLY CLRED (FROM THE BRAVO HOLD POINT) TO TAXI TO RWY 9 VIA TXWY B AND S-1. I PROCEEDED TO TAXI ALONG TXWY B, TRYING TO PAY PARTICULAR ATTN TO THE XING OF THE EXTENDED CTRLINES OF RWYS 9 AND 4L (SINCE I WAS WELL AWARE, FROM PREVIOUS EXPERIENCE, HOW POORLY THE CROSS-TXWYS ARE MARKED ALONG THIS RTE -- THEY ARE NOT MARKED AT ALL). I HAD ALREADY BRIEFED THAT WE WOULD NEED TO BE ESPECIALLY VIGILANT DUE TO THE BLOWING SNOW AND LACK OF CROSS-TXWY MARKINGS. WE BOTH HAD THE ARPT DIAGRAM IN FRONT OF US AND BOTH MONITORED THE TAXI PROGRESS. NEVERTHELESS, WHEN I TURNED L ONTO WHAT I THOUGHT WAS TXWY S-1, WE IMMEDIATELY DISCOVERED THAT WE HAD PASSED UP TXWY S-1 AND HAD INSTEAD TURNED ONTO TXWY S. THIS TXWY ALSO LEADS TO THE THRESHOLD OF RWY 9, MERGING WITH TXWY S-1 AT THE THRESHOLD. THERE WAS THEREFORE NO DANGER, NOR CONFLICT. WE DID, HOWEVER, TAXI VIA A RTE OTHER THAN WHICH WE WERE CLRED. CONTRIBUTING TO THIS MISTAKE, I BELIEVE, WERE 3 FACTORS: 1) EVEN THOUGH THERE WAS NO PRECIPITATION AT THE TIME OF OCCURRENCE, THE STRONG WIND AND SNOW BLOWING ACROSS THE TXWYS,WHEN COMBINED WITH NIGHT CONDITIONS, SIGNIFICANTLY RESTR PAVEMENT SURFACE VISIBILITY. 2) RESIDUAL DEICING FLUID ON THE SURFACE OF THE L, SIDE COCKPIT WINDOW RESTR VISIBILITY TO THE L. AND 3) THE MOST SIGNIFICANT CONTRIBUTING FACTOR IS THE LACK OF CROSS-TXWY MARKINGS FOR BOTH TXWY S1 AND TXWY S. IN RETROSPECT, I SHOULD HAVE HAD THE SIDE WINDOW WIPED CLR, BUT ALL ELSE, WITH REGARD TO MY ACTIONS, WAS EXACTLY AS I BELIEVE IT SHOULD HAVE BEEN. THESE PARTICULAR TXWYS SHOULD BE BETTER MARKED.

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.