ACR PLT SUGGESTS REVISION OF RWY 8R AND RWY 12 HOLD SHORT AREA IN ORDER TO PREVENT POSSIBLE RUNWAY INCURSIONS.

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WHILE TAXIING TO RWY 8R AT MIA; WE NOTICED AN AREA OF CONFUSION AT THE INTXN OF RWY 8R AND RWY 12. THE AREA CONTAINS THREE HOLD SHORT LINES -- VERY CONFUSING -- PROBABLY A PREVIOUS AREA OF PROBS -- MANY TIMES; ESPECIALLY GIVEN THE ENLARGED INSET OF THE AREA IN QUESTION. AS WE TAXIED; I ANNOUNCED I WAS 'INSIDE' FOR A FEW MOMENTS TO ACCOMPLISH SOME PAPERWORK FOR TKOF AND RUN A CHKLIST. I MADE NOTE OF THE AREA IN QUESTION; BUT INCORRECTLY ASSUMED THAT THE 'HOLD SHORT' LINE IN QUESTION WAS AN 'ILS HOLD SHORT LINE!' IT WAS NOT. AND I HAD MY ATTENTION DIVERTED. THE TWR ALERTED US TO 'STOP' AS WE BEGAN TO TAXI PAST THE FIRST; CONFUSING LINE. WE CAME TO A STOP ABOUT 10 FEET PAST THE LINE WITH THE NOSEWHEEL. NO PROBS OCCURRED; NO OTHER ACFT INVOLVED; OR ANY OTHER PROBS. THE AREA SHOULD NOT BE MARKED AS IT IS. IF THE FIRST LINE IS THE HOLD SHORT LINE; THE OTHER TWO (AT THE BEGINNING OF THE TWO RWYS) SHOULD BE ELIMINATED. THE ONE LINE WOULD SUFFICE FOR ALL OPS; ALL THE TIME. IF THE ARPT AND THE CHART WAS MORE CLEAR -- AND NOTICEABLE -- THE PROB AREA WOULD ALSO BE MORE OF AN ATTENTION GETTER; AND A PRE-TAXI BRIEFING POSSIBILITY; TOO. PRE-TAXI BRIEFINGS AND MORE ATTENTION WHILE TAXIING IS OF UTMOST IMPORTANCE AND SHOULD BE STRESSED IN ALL AREAS OF TRAINING AND OPS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE AND THE CAPT DID IN FACT REVIEW THE COMMERCIAL CHART'S HOT SPOT INSERT PRIOR TO TAXI; BUT WHEN THEY APCHED THE ACTUAL TXWY SITE; THEY WERE CONFUSED BY THE SIGNAGE. THIS PLT'S SUGGESTIONS WERE EITHER MAKE A SINGLE HOLD SHORT LINE OR PAINT 'ALL ACFT HOLD HERE' FOR E BOUND DEPS. HE FEELS THE POSSIBILITY OF MISSING THIS HOLD SHORT IS RELATIVELY GREAT WHILE PREPARING FOR TKOF WITH CHKLISTS TO COMPLETE; POSSIBLE WT AND BAL PROBS; A SHORT TAXI; AND INTERACTION WITH FLT ATTENDANTS.