AN S80 PIC CROSSES THE HOLD SHORT LINE FOR RWY 18L; BELIEVING HE HAD BEEN CLRED INTO POS AT DFW; TX.

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LOCATION: DFW. WE WERE TAXIING FOR TKOF ON RWY 18L. CONTACTED W GND ON THE BRIDGE AND WERE GIVEN STRAIGHT AHEAD FOR RWY 18L; WHICH WOULD BE INTXN Z TKOF. ASKED THE FO TO REQUEST A NEW TPS SINCE WE DIDN'T HAVE DATA FOR INTXN Z TKOF. CONTINUED TAXI; NOTING THAT THERE WAS ONLY ONE OTHER ACFT AHEAD OF US. THAT ACFT HAD BEEN HOLDING SHORT OF RWY 18L FOR AWHILE; SO I THOUGHT IT WAS PROBABLY GOING TO THE HANGAR; AND EXPECTED THAT WE WOULD BE CLRED FOR TKOF AS SOON AS WE GOT TO THE RWY. THAT ASSUMPTION FOR WHATEVER REASON BECAME A BELIEF THAT WE HAD BEEN CLRED INTO POS ON THE RWY. AS WE APCHED THE RWY; I ASKED THE FO; STILL BUSY WITH HER TKOF DATA; IF SHE WAS READY. SHE SAID; THAT WE WERE NOT CLRED INTO POS AND THAT WE WERE STILL ON GND CTL. I IMMEDIATELY STOPPED THE ACFT; BUT WE STILL CROSSED THE HOLD SHORT LINE BY SEVERAL FEET. WE WERE NOT OBSTRUCTING THE RWY; AND I HAD CHKED THE FINAL APCH FOR TFC; SO THERE WAS NO CONFLICT WITH LNDG TFC. WE CONTACTED THE TWR CTLR WHO DID NOT EXPRESS CONCERN. EVENT WAS LIKE GND SCHOOL WHERE YOU PRETTY MUCH GO WHEN YOU'RE READY; POSSIBLY A LITTLE FATIGUE; AND HOPING FOR AN EXPEDITIOUS DEP SINCE WE WERE 2 HRS LATE; ARE POSSIBLE REASONS.