A NEAR RWY INCURSION. AN MD80 FLC ON ROLLOUT FAILS TO ADHERE TO THE TWR CTLR'S INSTRUCTIONS ABOUT TURNING BACK ONTO TXWY F AND ENTERS TXWY F7; STOPPING JUST SHORT OF THE HOLD LINE FOR RWY 7L AT PHX; AZ.

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DURING THE LNDG ROLLOUT ON PHX NEW RWY 7R; WHILE SLOWING TO EXIT SPD FOR TXWY F7; TWR GAVE US DIRECTIONS FOR TAXI; WHICH I HEARD AS 'OK; FLT XXX; I WANT YOU TO MAKE 2 LEFTS; BLAH; BLAH FOXTROT BLAH; BLAH; HOLD SHORT BLAH; BLAH INTXN.' I WAS BRAKING THE ACFT; STOWING THE REVERSERS AND PULLING OFF THE RWY DURING THE XMISSION. TXWY F7 HAS ABOUT A 30 DEG HIGH SPD TURN ANGLE; FOLLOWED BY A 90 DEG TURN TO THE L; PERPENDICULAR TO RWY 7L. THESE 2 RWYS ARE EXTREMELY CLOSE TOGETHER AND ARE DIVIDED BY AN E/W TXWY F. WHEN I HEARD THE '2 LEFTS' INSTRUCTION; I THOUGHT THE TWR WANTED; THE 30 DEG L HIGH SPD CUTOFF TURN; FOLLOWED BY THE 90 DEG L FACING RWY 7L. WHAT HE ACTUALLY WANTED WAS A 30 DEG TURN AT TXWY F7; FOLLOWED BY A 150 DEG TURN BACK WBOUND ON TXWY F. WHEN I ROLLED PAST TXWY F; TWR STARTED YELLING 'TURN L; TURN L.' I HAD ALREADY PROCEEDED TOO FAR PAST TXWY F TO MAKE THE TURN; AND WAS LOOKING BACK OVER MY L SHOULDER TRYING TO DETERMINE WHERE HE WANTED ME. I REALIZED THEN THAT WE HAD OVERSHOT TXWY F; AND WITH ABRUPT BRAKING; STOPPED SHORT OF THE HOLD LINE OF RWY 7L. WHILE I WILL CERTAINLY BE ANTICIPATING THIS 180 DEG TURN BTWN RWYS THE NEXT TIME I LAND IN PHX; I MUST SAY THAT IN 26 YRS OF FLYING HVY ACFT; I HAVE NEVER BEEN ASKED TO PERFORM SUCH A TURN AFTER ROLLOUT. THIS COULD EASILY HAVE RESULTED IN A RWY INCURSION; AND I FEEL THAT IT COULD POTENTIALLY BE EXTREMELY HAZARDOUS. IF WE HAD BEEN TOLD SIMPLY TO HOLD SHORT OF RWY 7L; THIS WOULD NOT HAVE OCCURRED; AND BECAUSE THE INSTRUCTIONS WERE UNCLR TO ME; I SHOULD HAVE STOPPED IMMEDIATELY AFTER CLRING THE RWY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR FELT THAT THE CTLR WAS PROBABLY CLR IN HIS INTENTIONS; BUT THE CLRNC WAS NOT ABSORBED BY EITHER THE CAPT OR THE FO. THE CAPT MISSED THE INTENT OF THE CLRNC AND THE FO SAID LATER; 'HE WASN'T CERTAIN' OF THE INTENT; BEING CONFUSED ALSO AS TO THE INTENT OF THE CTLR. CTLR HAD PLANNED THEM TO USE TXWY F4 OR TXWY F5. CAPT HAD USED THE NEAR RWY 25L; BUT NOT RWY 7R; THE RECIPROCAL RWY. RPTR HAS NOT YET CONTACTED THE COMPANY; BUT PLANS TO UPON RETURN FROM VACATION. HE DID NOT DISCUSS THE INCIDENT WITH ATC NOR DID ATC CALL HIM FOR A REVIEW. CAPT STATED THAT HE ASSUMED THAT THE CTLR WANTED HIM TO HOLD AT TXWY F7. THE RWY LAYOUT IS SIMILAR TO THE USAGE OF RWY 24R AT LAX; WHERE CREWS EXIT ON A HIGH SPD AND HOLD SHORT OF RWY 24L. HE FELT THIS RWY LAYOUT LEFT LITTLE ROOM FOR ERROR. FINALLY; HE FELT THAT HAD THE TWR PREWARNED HIM ON FINAL OF THEIR TAXI PLAN; HE COULD HAVE PLANNED FOR A SLOWER EXIT SPD AT THE HIGH SPD AT TXWY F7.