PLT OF A CESSNA 210 FAILED TO HOLD SHORT OF THE R PARALLEL RWY WHILE TAXIING TO THE L PARALLEL RWY TO WHICH HE HAD NOT BEEN CLRED.

Narrative

I ARRIVED AT PALM BEACH INTL (PBI) AND BLOCKED IN AT XA07Z AND BLOCKED OUT AT XA11Z. I BELIEVED I WAS CLRED TO RWY 9L. I WAS INSTRUCTED TO HOLD SHORT OF RWY 13/31. I TAXIED W ON TXWY E; AND APCHING RWY 13/31 I WAS CLRED TO CROSS. I VISUALLY CLRED THE RWY AND FINAL AND CONTINUED ACROSS TO TXWY F. PROCEEDING NW ON TXWY F I ASKED THE GND CTLR IF IT WOULD HELP IF I DEPARTED AT THE TXWY F INTXN (TXWY F INTERSECTS RWYS 9L AND NOT RWY 9R). THE CTLR RESPONDED THAT IT WOULD PROBABLY NOT HELP BECAUSE OF ARRIVING ACFT. I RESPONDED THAT I WOULD CONTINUE TO THE END; REFERRING TO RWY 9L ALTHOUGH UNFORTUNATELY I DID NOT SPECIFY WHICH RWY. I TAXIED W ON TXWY R TO THE W END. APCHING THE END I CONSIDERED QUERYING THE CTLR ABOUT MY CLRNC TO CROSS RWY 9R BUT RECALLING MY CONVERSATION WITH GND ABOUT TAKING THE RWY 9L INTXN I WAS CONVINCED THAT I WAS CLRED TO RWY 9L. I STOPPED AND VISUALLY CLRED THE RWY AND FINAL. I SAW NO CONFLICTS AND PROCEEDED ACROSS AND HELD SHORT OF RWY 9L ON TXWY S. I CALLED TWR AND WAS TOLD TO CONTINUE HOLDING SHORT FOR LNDG TFC AND I COMPLIED. AFTER THE TFC LANDED I WAS CLRED FOR TKOF ON RWY 9L. I DEPARTED AND PROCEEDED TO FT LAUDERDALE INTL (FLL) WHERE THE GND CTLR INSTRUCTED ME TO CALL PALM BEACH TWR. A THAT TIME PBI TWR INFORMED ME THAT I HAD BEEN CLRED TO RWY 9R NOT RWY 9L AND HAD CROSSED RWY 9R WITHOUT CLRNC TO DO SO. ACCORDING TO THEM I WAS ISSUED CLRNC TO RWY 9R AND READ IT BACK. I DO NOT DISPUTE THIS. I ONLY REMEMBER BELIEVING I WAS CLRED TO RWY 9L. CONTRIBUTING FACTORS: 1) IN RETROSPECT I WAS TOO FOCUSED ON MAKING UP TIME AS I WAS BEHIND SCHEDULE. HAD I TAKEN MORE TIME TO WRITE DOWN MY TAXI INSTRUCTIONS AS I HAD MY DEP CLRNC THIS WOULD HAVE BEEN AVOIDED. 2) WHEN I HAD A MOMENT OF DOUBT ABOUT MY CLRNC I SHOULD HAVE ASKED INSTEAD OF CONVINCING MYSELF I WAS RIGHT BASED ON MY CONVERSATION WITH GND ABOUT THE INTXN DEP AND CONTINUING TO THE END. 3) I SHOULD HAVE USED MORE PRECISE LANGUAGE AND SPECIFIED I WAS CONTINUING TO RWY 9L. THIS MIGHT HAVE BETTER KEYED THE CTLR TO REALIZE I WAS GOING TO THE WRONG RWY. THIS WAS NOT A DELIBERATE DEFIANCE OF THE CTLR'S INSTRUCTIONS BUT AN UNFORTUNATE MISTAKE. I WILL CERTAINLY BE MORE DILIGENT AND CAUTIOUS IN THE FUTURE.