Narrative:

On landing roll encountered very low visibility fog bank last 1/3 of runway 23R at tys. I discussed lower than reported visibility to tys tower as airport was reporting 3 mi and another aircraft was commencing approach to 23R. I rolled all the way to the end of 23R and was slow, to very slow, taxi speed due to almost 0/0 visibility. I could see the B1 taxiway throat and apparently the taxiway edge lights with the reflection of the taxi light and fog appeared green rather than blue. I went for the lights out of the habit of following green taxiway centerline lights and ran the nosewheel and left main gear through the grass on the edge of the taxiway throat. Fortunately, the ground was dry and firm and the aircraft rolled across the grass and back onto the hard surface without getting stuck. I called the tower and requested that they check to see if I had run over any taxiway lights although I didn't feel the aircraft strike any. Upon arrival at the gate, I made a logbook entry and had maintenance check the gear. No damage was found. I feel this phenomenon of blue lights appearing green should be checked and pilots should be cautioned about this possibility in very low visibility sits.

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Original NASA ASRS Text

Title: AN ACR MLG MISTOOK TXWY EDGE LIGHTS (BLUE) FOR TXWY CTRLINE LIGHTS (GREEN) AND TAXIED INTO THE WEEDS.

Narrative: ON LNDG ROLL ENCOUNTERED VERY LOW VISIBILITY FOG BANK LAST 1/3 OF RWY 23R AT TYS. I DISCUSSED LOWER THAN RPTED VISIBILITY TO TYS TWR AS ARPT WAS RPTING 3 MI AND ANOTHER ACFT WAS COMMENCING APCH TO 23R. I ROLLED ALL THE WAY TO THE END OF 23R AND WAS SLOW, TO VERY SLOW, TAXI SPD DUE TO ALMOST 0/0 VISIBILITY. I COULD SEE THE B1 TXWY THROAT AND APPARENTLY THE TXWY EDGE LIGHTS WITH THE REFLECTION OF THE TAXI LIGHT AND FOG APPEARED GREEN RATHER THAN BLUE. I WENT FOR THE LIGHTS OUT OF THE HABIT OF FOLLOWING GREEN TXWY CTRLINE LIGHTS AND RAN THE NOSEWHEEL AND L MAIN GEAR THROUGH THE GRASS ON THE EDGE OF THE TXWY THROAT. FORTUNATELY, THE GND WAS DRY AND FIRM AND THE ACFT ROLLED ACROSS THE GRASS AND BACK ONTO THE HARD SURFACE WITHOUT GETTING STUCK. I CALLED THE TWR AND REQUESTED THAT THEY CHK TO SEE IF I HAD RUN OVER ANY TXWY LIGHTS ALTHOUGH I DIDN'T FEEL THE ACFT STRIKE ANY. UPON ARR AT THE GATE, I MADE A LOGBOOK ENTRY AND HAD MAINT CHK THE GEAR. NO DAMAGE WAS FOUND. I FEEL THIS PHENOMENON OF BLUE LIGHTS APPEARING GREEN SHOULD BE CHKED AND PLTS SHOULD BE CAUTIONED ABOUT THIS POSSIBILITY IN VERY LOW VISIBILITY SITS.

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.