FLC OF MLG IS GIVEN TAXI INSTRUCTIONS BUT CANNOT LOCATE THE TXWY L SIGN AND TAXIES TO HOLD SHORT LINE OF RWY. AFTER MAKING A 180 DEG TURN THE GND CTLR TELLS THEM TO TURN. THE SIGNAGE FOR TXWY L WAS STILL NOT VERY VISIBLE.

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THE EVENT/SIT THAT RESULTED FROM THE FOLLOWING ACCOUNT WAS A NEAR RWY INCURSION. RPTED WX DURING PREVIOUS APCH WAS 400 FT AND 2.5 MI VISIBILITY. ACTUAL WX ENCOUNTERED AT CONCLUSION OF APCH WAS ABOUT 1 MI AND FOG. PRIOR TO PUSH ON NEXT FLT; THE CHKLISTS; TKOF BRIEFING; AND TAXI BRIEFING WERE COMPLETE. AFTER PUSHBACK WAS COMPLETE; THE FO CALLED FOR TAXI AND GND CTL'S TAXI CLRNC WAS 'TAXI TO RWY 5L; HOLD SHORT OF RWY 5R AT TXWY N.' CLRNC WAS READ BACK ON RADIO AND IN THE COCKPIT. BOTH HEADS WERE UP IN THE COCKPIT AND EYES OUTSIDE. THE CAPT SAID HIS INTENDED RTE WAS 'TXWY S; L ON TXWY L TO TXWY N.' A L TURN OUT OF THE GATE AREA WAS DONE ONTO TXWY S LOOKING FOR TXWY L. BOTH PLTS COMMENTED THAT THE VISIBILITY WAS LESS THAN ARR. SIGNS OR MARKINGS FOR TXWY L WERE NOT SEEN BY EITHER CREW MEMBER AND CONTINUED ON TXWY S. THE S EDGE OF TXWY S TAXI LIGHTS START A GRADUAL TURN TOWARDS THE S AS PART OF A HIGHER SPD EXIT OFF OF RWY 5R. THIS LED THE CREW TO THINK THIS WAS THE LEAD-IN TO TXWY L. RWY EDGE LIGHTS AND THEN THE HOLD SHORT LINES WERE SEEN; AND THE ACFT WAS STOPPED PRIOR TO THE RWY. THE CAPT MADE A L 130 DEG TURN ON TXWY S AND LOOKED R FOR A TXWY L SIGN. THE ONLY SIGN FOR TXWY L THE CREW COULD SEE WAS ON THE W SIDE OF TXWY L AND 200 FT S OF TXWY S. AT THE TIME THE ACFT MADE THE 180 DEG TURN; GND CTL SAID 'THAT IS RWY 5 AHEAD.' THE NEXT GND XMISSION WAS A REQUEST FOR THE CAPT TO CALL THE TWR UPON NEXT ARR ABOUT A POSSIBLE 'PLTDEV.' THE TWR WAS CALLED AND PLT NOTIFIED THAT THE GND RADAR SHOWED THEM ON THE RWY. TO HELP PREVENT POSSIBLE RWY INCURSIONS; WIDE; MULTIPLE TXWY INTXNS SHOULD BE WELL 'SIGNED' AND PAVEMENT MARKINGS USED TO BETTER DISCERN CORRECT DIRECTION OF INTENDED TAXI RTE.