SMA TAXIES ONTO RWY WITH INSTRUCTION TO TAXI 'TO.'

Narrative

I RECEIVED MY VFR CLRNC. I THEN CONTACTED RALEIGH GND CTL AND REQUESTED TO 'TAXI TO THE ACTIVE WITH ATIS INFO -- ENTERING AT NR6 WITH RUNUP COMPLETED.' GND CTL INFORMED ME TO HOLD SHORT OF TXWY ALPHA. THIS WAS TO ALLOW AN ACR TO ENTER THE ACTIVE RWY -- 23L -- FOR DEP. GND CTL INFORMED ME 'CAUTION JET BLAST!' AS I HELD SHORT OF TXWY ALPHA. AFTER THE JET WAS AIRBORNE; GND CTL REQUESTED I 'TAXI TO 23L;' WHEREUPON I TAXIED ONTO RWY 23L. I WAS THEN INFORMED THAT I HAD NOT BEEN CLRED TO TAXI ONTO THE RWY. (AFTER I APOLOGIZED; I WAS THEN TOLD TO CONTACT THE TWR AFTER ARRIVING AT MY DEST ARPT.) I WAS THEN CLRED FOR TKOF. CAUSE: NR-6 BEING CLOSE TO THE RWY 23L; I THOUGHT I WAS BEING CLRED TO TAXI ONTO THE RWY EVEN THOUGH I WAS STILL WITH GND CTL. REMEDY: I BELIEVE THAT GND CTL SHOULD ALWAYS INCLUDE 'HOLD SHORT OF RWY' IN THE INSTRUCTION. THIS IS PARTICULARLY IMPERATIVE AT A BUSY ARPT LIKE RDU. ANOTHER APCH WOULD BE TO HAVE A SIGN 'HOLD SHORT UNTIL TWR CLRNC.' BOTH REMEDIES WOULD NOT BE TOO MUCH.