MD88 HAS A RWY INCURSION AT MONROE; LA.

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ACFT WAS PUSHED BACK FROM GATE AT MLU ON TO TXWY G APPROX 30 YARDS FROM THE INTXN OF TXWY C. GND CTL CLRED US TO TAXI TO RWY 22 ON TXWY C; HOLD SHORT OF RWY 18. WE ACKNOWLEDGE THE CLRNC. AS WE TURNED ONTO TXWY C I NOTICED THE RED SIGNAGE AHEAD THAT I THOUGHT DESIGNATES RWY 18. IT WAS OBSERVED BY THE WINDOW POST DURING THE TURN AND I DID NOT NOTICE THAT IT WAS FOR RWY 14/32. AT NO TIME DID I RECOGNIZE ANY STANDARD SIGNAGE FOR RWY 18 NOR DID I DETECT A HOLD LINE. (TXWY MARKINGS ARE FAINT AND DIFFICULT TO SEE AT MLU). THE GND CTLR ISSUE A 'STOP' COMMAND TO US AS WE TAXIED ON TXWY C. THE ACFT WAS BROUGHT TO A STOP AS QUICKLY AS POSSIBLE. THE FO AND I DIDN'T UNDERSTAND THE REASON FOR HIS XMISSION; BELIEVING RWY 18 TO BE UP AHEAD. QUICKLY CHKING OUR POS WE REALIZE WE WERE ABOUT TO CROSS THE RWY 18. CONTRIBUTING FACTORS: TXWY MARKINGS; WORN AND FAINT POSSIBLY OBSCURING THE HOLD SHORT POS. THE SHORT DISTANCE OF TXWY C FROM TXWY G TO RWY 18. AT MOST ACR ARPTS OUR HABITUAL ROUTINE IS TO POS THE ACFT ON A TXWY ON WHICH IT FITS; NOSE TO TAIL. I KEPT FIGHTING ALL DAY TRYING TO RID THE NOTION OF BEING AT BATON ROUGE WHERE THE HOLD SHORT POS IS THE SAME AS RWY 14/32. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR RARELY FLIES INTO THIS ARPT. HE MENTALLY ASSOCIATES THIS FIELD WITH ANOTHER AND AT TIMES; FINDS IT CONFUSING. HE FOUND THE RWY SIGNAGE GOOD ON A SUBSEQUENT VISIT TO THE FIELD. HE FEELS THE HOLD LINE COULD BE MORE DEFINITE. IT APPEARED FAINT AND FADED TO HIM IN HIS RECOLLECTION.