AT THE REQUEST OF THE LCL CTLR; A306 CREW TURNS OFF RWY 28R AT BIL ON RWY 25. DELAY DETERMINING LOCATION CAUSES SUBSEQUENT ARR TO BE REDIRECTED TO RWY 28L.

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WE WERE LNDG IN BILLINGS ON THE FINAL LEG OF A LONG WK OF NIGHT FLYING. I HAVE FLOWN INTO BILLINGS SEVERAL TIMES; AND AM FAIRLY FAMILIAR WITH THE ARPT LAYOUT. WE NORMALLY LAND ON RWY 28R AND TURN L ON TXWY G; THEN L ON TXWY J TO OUR RAMP. OUR COMMERCIAL CHART PROVIDER 10-9 PAGE HAS A BOXED NOTE STATING TXWY E IS CLOSED TO ACFT OVER 14500 LBS. DURING OUR APCH TO RWY 28R; WE KNEW THAT A SMALL ACFT WAS SEVERAL MI BEHIND US FOR LNDG. DURING THE LNDG ROLLOUT; THE CTLR TOLD US TO 'TAKE THE NEXT L TURN.' SINCE WE NORMALLY ROLL OUT TO TXWY G; THIS INSTRUCTION IMPLIED TO ME SOME SENSE OF URGENCY. I MADE THE L TURN; BUT WASN'T IMMEDIATELY SURE EXACTLY WHERE WE WERE. THIS RWY EXIT PUT US INITIALLY ON RWY 25 BEFORE MEETING TXWY F. I WASN'T SURE IF THE TXWY ON MY L WAS TXWY E; WHICH IS PROHIBITED. I WAS VERY CONSCIOUS OF OUR TAIL HANGING OUT ONTO RWY 28R; SO I WANTED TO EXIT AS QUICKLY AS POSSIBLE. FOR SOME REASON I WAS EXPECTING TO BE CLRED TO TAXI UP RWY 25 TO TXWY G. I CONTINUED TO CREEP FORWARD WHILE TRYING TO GET THE FO TO GET CLRNC TO TAXI ON RWY 25. WHEN HE FINALLY ASKED; ATC SAID RWY 25 WAS NOT AVAILABLE TO US BECAUSE OF OUR WT. BY THEN; I HAD ROLLED FORWARD TO THE POINT WHERE I WASN'T SURE I COULD STILL TURN L ONTO TXWY F. I FELT IT WOULD BE UNSAFE TO ATTEMPT THE TURN ONTO TXWY F. OUR TAIL WAS STILL A FACTOR ON RWY 28R. THE OTHER ACFT SIDESTEPPED AND LANDED ON RWY 28L. AFTER SEVERAL MINS; ATC TOLD US TO TAXI ON RWY 25 TO TXWY G. I BELIEVE THAT THE FACTORS INVOLVED HERE WERE MY EXPECTATION TO EXIT AT TXWY G; ATC'S IMPLIED URGENCY; AND FATIGUE. I WAS VERY TIRED AT THIS TIME; AND LOST MY SITUATIONAL AWARENESS DURING A FEW MOMENTS OF CONFUSION. THE FACT THAT TXWY G IS A FORMER RWY ALSO GAVE ME THE IMPRESSION THAT WE WOULD TAXI ON RWY 25. IN REVIEW OF THE 10-9 PAGE AFTER THIS INCIDENT I DISCOVERED THE FOOTNOTE WITH THE RWY WT RESTRS. IF THOSE RESTRS WERE MORE PROMINENT; I WOULD HAVE BEEN AWARE OF THEM; AND WOULD NEVER HAVE GOTTEN INTO THIS SIT.