PLT MISTAKENLY CROSSES A RWY AT FUL THAT HE WAS CLRED TO RESULTING IN A RWY INCURSION.

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ON JUN/SUN/04; PREPARING TO LEAVE FUL; I ASKED FOR CLRNC TO TAXI FROM FBO WITH THE CURRENT ATIS. I WAS INSTRUCTED TO 'TAXI TO RWY 24.' AS I TAXIED AWAY FROM FBO ALONG TXWY A BTWN TXWY F AND TXWY E; I OBSERVED LNDG TFC ON RWY 24. AS I APCHED TXWY E; I OBSERVED THE LNDG TFC TURN OFF RWY 24 TO TXWY F. I ALSO OBSERVED APCHING TFC ON FINAL TO RWY 24. RECALLING INSTRUCTIONS FROM THE PREVIOUS DAY; AND RECALLING INSTRUCTION FROM MY CFI THAT CLRNC TO A RWY ABSENT HOLD SHORT INSTRUCTIONS INCLUDED CLRNC TO CROSS INTERSECTING RWYS; AND OBSERVING THAT I COULD SAFELY CROSS RWY 24/6 AHEAD OF TFC ON FINAL; I CROSSED RWY 24/6 AT TXWY E FOR TXWY B AS I HAD BEEN INSTRUCTED TO DO THE PREVIOUS DAY WITH PROGRESSIVE INSTRUCTIONS. THE TWR IMMEDIATELY ASKED 'ACFT X; WHERE DO YOU THINK YOU ARE GOING?' I ANSWERED THAT I'D BEEN CLRED TO RWY 24; AND THAT SUCH CLRNC WOULD INCLUDE CLRNC ACROSS INTERSECTING RWYS. TWR REPLIED; 'THAT'S A BIG NEGATIVE ACFT Y.' I REPLIED THAT IF THAT WAS SO; IT WAS MY MISTAKE AND OFFERED AN APOLOGY. AFTER COMPLETING MY FLT; I LOOKED UP TAXI INSTRUCTIONS IN THE AIM. I WAS DISTRESSED TO LEARN THAT ALTHOUGH 4-3-18(A)5 DOES SPECIFY THAT A CLRNC TO TAXI TO A SPECIFIC RWY DOES INCLUDE CLRNC TO CROSS ALL INTERSECTING RWYS; IT SPECIFICALLY EXCEPTS THE ASSIGNED RWY. THIS WAS MY MISTAKE DUE TO INEXPERIENCE AND A MISUNDERSTANDING OF THE RULES TO CROSS INTERSECTING RWYS BUT NOT THE ASSIGNED RWY THIS IS A MISTAKE I AM NOT LIKELY TO REPEAT. I MIGHT SUGGEST; HOWEVER; THAT GIVEN THE INTERMITTENT TXWY ON THE S SIDE OF RWY 24/6 AT FUL; TWR INSTRUCTIONS SHOULD INCLUDE HOLD SHORT INSTRUCTIONS FOR RWY 24/6; SINCE THE BEST WAY TO TAXI TO RWY 24 IS TO CROSS RWY 24/6 TO TXWY B.