ACR DHC8 LANDED RWY 09 AND TOLD TO CLR AT THIRD TXWY AND HOLD SHORT OF THE PARALLEL TXWY. CAPT RPTR DID NOT CLR THE RWY AS HE FELT HE COULD NOT COMPLY WITH THE HOLD SHORT OF PARALLEL INSTRUCTIONS AND ALLOW TWR TO CLR OTHER ACFT FOR TKOF. RPTR QUESTIONS COMPETENCY OF THE NON FEDERAL TWR CTLRS.

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LNDG ON RWY 09 NORMAL. TOLD BY LCL CTR; EYW (NOW A NFCT) 'TURN R NEXT INTXN; HOLD SHORT OF THE PARALLEL; CONTACT GND POINT 7.' THIS WAS THE LAST TURNOFF BEFORE THE RWY END; OR THE THIRD TURNOFF TRAVELING DOWN RWY 09. WE NOTED WHILE BEGINNING OUR FLARE A METRO COMMUTER AND BEHIND IT; A CONVAIR RECIPROCATING AWAITING TKOF. THE INTXN TURNOFF IS SO SHORT; THAT IF I HELD THE DASH 8 SHORT OF THE PARALLEL; THERE WAS A DANGER THAT THE TAIL WOULD NOT HAVE ADEQUATE CLRNC TO THE DEPARTING PLANE'S WINGTIP. TO ENSURE THERE WAS NO FOUL-UP/MISCOM BTWN GND AND LCL; AND A TKOF CLRNC BEING ISSUED; I MADE IT UNMISTAKENLY OBVIOUS TO BOTH GND; TWR; AND THE METRO THAT WE WERE NOT CLR OF THE RWY. I DECIDED TO LOITER ON THE RWY; FACING THE AIRLINE APRON. WE SWITCHED TO GND; AND GND INSTRUCTED US TO TAXI CLR OF THE RWY. I BELIEVE THE FO INFORMED GND THAT WE WERE DIRECTED TO HOLD SHORT OF THE PARALLEL. GND THEN STATED SOMETHING TO THE EFFECT OF 'I THOUGHT A COMMUTER WAS TAXIING OUT.' SINCE THIS SCENARIO HAD OCCURRED AT NIGHT ON A PREVIOUS OCCASION; AND THIS WAS NOW THE SECOND TIME; IT BECAME OBVIOUS TO ME THIS IS A HAZARDOUS PRACTICE USED BY THE TWR. I WAS PERTURBED BY WHAT I PERCEIVED AS A DELIBERATE HAZARDOUS INSTRUCTION BEING GIVEN BY ATC. I QUERIED THE GND CTLR WHY WE WERE NOT PERMITTED TO TAXI CLR OF THE RWY. AN ADEQUATE ANSWER WAS NOT GIVEN. GND STATED (I DON'T RECALL VERBATIM) 'YOU WILL READ IN THE AIM YOU CAN TAXI CLR OF THE ACTIVE.' THIS; OF COURSE; WAS CONTRARY TO THE 'HOLD SHORT OF THE PARALLEL' ORDER. GND THEN STATED 'YOU'RE THE FIRST PERSON WHO HAS COMPLAINED ABOUT IT.' THE FAA MUST TAKE NOTE -- THIS EXTREMELY HAZARDOUS PRACTICE IS CONTINUING UNABATED! A LNDG ACFT MUST ALWAYS HAVE PRIORITY; AND BE ALLOWED TO COMPLETELY CLR THE ACTIVE RWY WHENEVER OPERATIONALLY FEASIBLE. (UNFEASIBILITY OF COURSE; WOULD BE A CLRING ACFT TO CAUSE BLOCKAGE OF A SINGLE DIRECTION TXWY.) IF THIS SIT OCCURRED AT A COUNTRY; LOW DENSITY ARPT; WITH A SINGLE RWY; IMAGINE THE HAZARD AT A BUSY HUB ARPT; WITH MULTIPLE OPS IN EFFECT; MULTIPLE RWYS; WITH A JAM PACKED FREQ; AT NIGHT; IN RAIN!