PLT OF A MOONEY M20C QUESTIONS TWR CTLR PROC OF TAKING OFF ACFT ON A RWY WHEREIN THE EXTENDED CTRLINE CROSSES THE MAIN ACTIVE RWY WHEN OTHER ACFT COULD BE TAXIING ACROSS OR TAKING OFF.

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AFTER LNDG ON RWY 30 AT ACK; I TAXIED ACFT ONTO TXWY C ON THAT PORTION THAT LIES ON THE SOUTHERN SIDE OF RWYS 6/24. ALTHOUGH RWYS 12/30 AND 6/24 DO NOT PHYSICALLY INTERSECT; THE EXTENDED CTRLINE OF RWY 30 CLRLY INTERSECTS RWYS 6/24; JUST WEST OF MIDPOINT OF RWY 24. LUCKILY I LOOKED DOWN RWY 24 FROM WHICH DEPS WERE BEING CLRED BEFORE TAXING ACROSS TO THE OTHER SIDE OF TXWY C AND INTO PARKING BECAUSE TWR HAD CLRED A BARON TO TAKE OFF ON RWY 24. ALTHOUGH I HELD SHORT OF RWY 24; I BELIEVE THAT THERE IS A YELLOW HOLD SHORT BAR AS YOU TAXI OFF RWY 30 ONTO TXWY C. IN ANY EVENT; TWR NEVER ADVISED ME TO HOLD AT TXWY C AND NEVER ADVISED ME THAT TFC WAS ON THE TKOF ROLL ON RWY 24. GND THEN CLRED ME TO TAXI ACROSS RWY 6/24 AFTER BARON TOOK OFF AFTER WHICH I TERMINATED FLT SUCCESSFULLY. I AM STILL NOT SURE WHETHER THERE IS A HOLD SHORT BAR ON TXWY C WHICH REQUIRES ACFT LNDG ON RWY 30 TO HOLD OR WHETHER THE MARKINGS REQUIRE ACFT ON TXWY C TO HOLD SHORT OF RWY 12. I CALLED TWR LATER MYSELF (ALTHOUGH THE GND CTLR NEVER ADMONISHED ME) INQUIRING GENERALLY ABOUT THE TXWY MARKINGS. THE CTLR I TALKED TO TOLD ME THAT THERE IS A HOLD SHORT BAR ON TXWY C FOR TFC TAXIING OFF OF RWY 30. I AM CONCERNED THAT IF AN ACFT OVERSHOOTS A LNDG (OR ABORTS A TKOF) ON RWY 30 AFTER AN ACFT HAS BEEN CLRED TO TAKE OFF ON RWY 6 OR RWY 24 A DISASTER COULD RESULT. ALTHOUGH THE RWYS DO NOT TECHNICALLY 'INTERSECT;' THEIR ORIENTATION CREATES THE POTENTIAL FOR CATASTROPHE.