ATR72 CREW IMPINGED ON TXWY H WHILE CLEARING RWY 14 AT MYNN.

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WE LANDED ON RWY 14 AT THE NAS ARPT AS A A REGULARLY SCHEDULED FAR 121 FLT. I WAS THE FLYING PLT AND ACFT CTL WAS XFERRED TO THE CAPT; PER STD OPERATING PROC AS SET FORTH IN OUR SPECIFIC AIRLINE MANUAL. WHILE ROLLING OUT ON RWY 14; TWR ADVISED US TO EXIT TXWY 'BRAVO' AND CONTACT GND 121.7. WHILE STILL ON RWY 14; TWR CLRED ANOTHER ACFT FOR TKOF ON RWY 14. OUR APPROX DISTANCE FROM THE TXWY WAS 100-300 FT. THEREFORE; WE MADE TURN TO THE TXWY; I SWITCHED THE RADIO FREQ AND CONTACTED GND CTL. UPON CONTACTING GND; THE CTLR ASKED FOR OUR DEPARTING ARPT AND WE ADVISED OUR DEPARTING ARPT. THE GND CTLR THEN ADVISED; 'HOLD YOUR POS' NOT SPECIFICALLY STATING WHERE TO HOLD. WE STOP THE ACFT UPON RECEIVING THE CLRNC. AT THE TIME WE RECEIVED OUR CLRNC TO HOLD; THE ACFT ENTERED THE 'HOTEL' TXWY. THE GND CTLR THEN ASKED IF WE RECEIVED AND UNDERSTOOD THE 'HOLD YOUR POS' CLRNC AND INFORMED US WE VIOLATED HER INSTRUCTIONS. WE ADVISED THE CTLR WE RECEIVED HER CLRNC; BUT ALREADY ENTERED THE 'HOTEL' TXWY AT THE TIME SHE RELAYED HER CLRNC. WE ENTERED THE 'HOTEL' TXWY DUE TO THE LENGTH OF THE ATR72 ACFT AND THE VERY SHORT DISTANCE OF TXWY 'BRAVO' WHICH HAS NEITHER A 'HOLDING POS MARKING FOR TXWYS' OR A 'RWY BOUNDARY SIGN' TO ENSURE WE WERE CLR OF RWY 14; WHICH HAD AN ACFT THAT ALREADY RECEIVED TKOF CLRNC. IT IS MY OPINION THAT WE MADE THE CORRECT DECISION TO ENTER TXWY 'HOTEL TO ENSURE WE WERE CLR OF RWY 14. IT IS ALSO MY OPINION THAT THE FOLLOWING WERE CONTRIBUTING FACTORS: 1) EXCESSIVE SPEED ENTERING TXWY 'BRAVO DUE TO ADDITIONAL ACFT RECEIVING TKOF CLRNC BEFORE WE STARTED CLEARING RWY 14. 2) ABSENCE OF TXWY MARKINGS/BOUNDARY SIGNS. 3) NONSTD TERMINOLOGY BY GND CTL. AFTER WE EXPLAINED OUR ACTIONS TO THE GND CTLR; WE TAXIED TO THE PARKING AREA FOR OUR COMPANY OPS AFTER RECEIVING FURTHER TAXI CLRNC. THE CREW WAS WELL RESTED AND FATIGUE DID NOT PLAY ANY PART IN OUR DECISION MAKING. I BELIEVE TO PREVENT A RECURRENCE OF THE EVENT: THE ARPT NEEDS TO HAVE CLEARLY MARKED TXWYS AND OR SIGNS. THE ARPT HAS SOME MARKINGS; BUT THE MARKINGS ARE NOT CONSISTENT AND IN SOME PLACES ARE 'NON-EXISTENT.' FURTHERMORE; ALTHOUGH THIS INCIDENT HAPPENED DURING DAYLIGHT VMC CONDITIONS; MANY TXWY LIGHTS ARE OBSCURED BY HIGH GRASS/WEEDS; WHICH ADVERSELY AFFECTS NIGHT OPS AT THE MYNN ARPT; WHICH COULD LEAD TO A SIMILAR INCIDENT IN THE FUTURE.