BE20 FLC CROSS TEB RWY 6 ENRTE TO TXWY G TO RWY 6 APCH END AND CHALLENGED BY TWR BECAUSE OF THE XING. RPTR QUESTIONS AIM GUIDANCES TO PLT AND CTLR AS NOT SUFFICIENTLY CLR.

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I WAS ACTING AS THE FO AND THE PF FROM THE L SEAT OF A KING AIR B200 ACFT. THE CAPT WAS OCCUPYING THE R SEAT OF THE ACFT. AT APPROX XA20; WE HAD STARTED ENGS AND RECEIVED TAXI CLRNC TO RWY 6 AT TEB ARPT FROM OUR POS AT THE FBO. THE TWR CTLR WAS USING TWR FREQ TO CTL BOTH GND AND TWR TFC; AND INSTRUCTED US TO FOLLOW A MOONEY TO RWY 6. AFTER WE WAITED BRIEFLY AND DID NOT SEE THE MOONEY; WE QUERIED THE TWR CTLR AND THE CTLR ASKED THE MOONEY FOR HIS POS. AFTER THE MOONEY REPLIED STATING HE WAS DELAYED GETTING OUT OF PARKING; THE TWR CTLR CLRED US TO TAXI TO RWY 6. FROM OUR POS AT THE FBO WE WERE ALREADY AT TXWY G; WHICH CROSSES RWY 6. IT IS NECESSARY TO CROSS RWY 6 AT TXWY G TO GET TO THE PARALLEL TXWY ON THE OTHER SIDE OF THE RWY AND PROCEED TO THE HOLD SHORT POINT FOR TKOF ON RWY 6. AFTER RECEIVING CLRNC TO TAXI TO RWY 6; WE VISUALLY CHKED FOR TFC ON THE TXWYS; THE RWY; AND IN THE AIR AND PROCEEDED ACROSS RWY 6 AT TXWY G AND CONTINUED TAXIING TO THE HOLD SHORT POINT AT THE APCH END OF RWY 6. AT THIS POINT; THE TWR CTLR TOLD US HE HAD NOT GIVEN US CLRNC TO CROSS RWY 6; SINCE IT WAS THE ACTIVE RWY AND CLRNC TO TAXI TO THE ACTIVE RWY DOES NOT GIVE YOU CLRNC TO CROSS THE ACTIVE RWY. ALTHOUGH THE CTLR WAS CORRECT; THE TERMINOLOGY USED FOR OUR TAXI CLRNC STRONGLY IMPLIED WE SHOULD TAXI ACROSS RWY 6; SINCE WE WERE ALREADY CLOSE TO THE HOLD SHORT LINE FOR RWY 6 AT TXWY G WHEN THE CTLR ISSUED OUR TAXI CLRNC. TO US; THE WORDING USED IN THE CLRNC IN NO WAY IMPLIED WE SHOULD HOLD SHORT AT TXWY G. WITH THE PROB RWY INCURSIONS HAVE BECOME THROUGHOUT THE INDUSTRY AND AT MANY LOCATIONS; TAXI INSTRUCTIONS SHOULD BE MUCH MORE PRECISE. ANY CLRNC GIVEN TO ANY RWY SHOULD INCLUDE INSTRUCTIONS TO HOLD SHORT AT ANY RWY; IF NECESSARY. AIM SECTION 4-3-18; PARAGRAPHS 5; 6; AND 7; SHOULD BE REWRITTEN TO REMOVE CONFUSING GUIDANCE; AND TO REQUIRE THE CTLR TO ISSUE HOLD SHORT INSTRUCTIONS FOR ANY RWY; INCLUDING THE ACTIVE/ASSIGNED DEP RWY; SO AS TO AVOID ANY POSSIBLE AMBIGUITY TO BOTH THE CTLR AND THE PLT.