A DC9 TAXIING OUT FROM GATE AREA FOR TKOF AT NIGHT WITH FOG; SNOW; AND ICE; TAKES WRONG RTE AND ENTERS A CLOSED TXWY. FURTHER CLRNC FROM ATC TO CONTINUE THROUGH THE CLOSED AREA IS GIVEN. PLT RPTR BLAMES CONSTRUCTION WORK AND LACK OF SUFFICIENT LIGHTING AS REASON.

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WE PUSHED BACK FROM GATE; STARTED ENGS; AND WERE CLRED TO TAXI VIA TXWY H TO RWY 21C; DEICE REMOTE PAD. DUE TO POOR VISIBILITY IN RAIN AND SNOW; I ELECTED TO TURN L OUT OF GATE. APPARENTLY I TURNED ONTO A CLOSED TXWY BTWN TXWY K11 AND K12; WHICH DOESN'T SHOW ON OUR TAXI CHART. THERE ARE NO BLUE EDGE LIGHTS TO MARK THIS AS A CLOSED EDGE AND OUR TURN WAS SO TIGHT THAT IF THERE IS AN 'X' ON THE E END OF THE CLOSED TXWY; I DID NOT SEE IT; AS WE TURNED TIGHTLY TO THE L. AS WE PROCEEDED W; MY NOSE TAXI LIGHT ILLUMINATED A YELLOW 'X' ON THE TXWY WE WERE ON. I STOPPED AND WE THEN GOT CLRNC TO PROCEED W TO TXWY Y AND CONTINUE CLOCKWISE AROUND BACK ONTO TXWY H. THE END OF THE C CONCOURSE IS UNDER CONSTRUCTION AND THE AREA IS NOT VERY WELL MARKED. I SIMPLY TURNED ONTO THE WRONG TXWY UNDER POOR VISIBILITY CONDITIONS. IN MY OPINION; THE WHOLE AREA OF TXWYS S AND W OF THE END OF CONCOURSE C IS VERY CONFUSING DUE TO THE NUMEROUS DIAGONAL TXWYS XING EACH OTHER. UNDER POOR LIGHT AND VISIBILITY; IT IS RATHER DIFFICULT TO FIND YOUR WAY AROUND. THE GND CTLRS ARE SO BUSY; EVEN IF YOU HAVE A QUESTION ABOUT HIS INSTRUCTIONS; YOU RARELY CAN GET A WORD IN TO ASK A QUESTION. THIS AREA; IN MY OPINION; REQUIRES EXTRAORDINARY PRECAUTIONS.