A PLT OF AN SMA RETURNED TO THE RWY AFTER ENTERING A HIGH SPD TURNOFF TXWY BECAUSE HE OVERSHOT THE TURN TO THE PARALLEL TXWY. THIS PUT HIM ON ANOTHER HIGH SPD TXWY THAT RE-ENTERED THE RWY.

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AFTER AN 8 HR FLT FROM MANAGUA; NICARAGUA; WITH A FUEL STOP IN BELIZE; WITH 2 HRS OF RED TAPE; WE LANDED ON RWY 27R AT MIAMI INTL. WE EXITED THE RWY AT LIMA 6 AND WERE TOLD BY THE TWR TO CONTACT GND CTL ON 121.8; WHICH I DID. I TOLD THE CTLR THAT WE NEEDED TO GO TO CUSTOMS. HE TOLD ME TO TURN L; WHICH I DID; BUT THIS PUT US ON LIMA 5 AND BACK ON THE RWY. AS SOON AS I SAW THE RWY LIGHTS; I IMMEDIATELY MADE A 180 DEG TURN AND WAS TAXIING OFF AGAIN WHEN THE CTLR SAID; 'YOU ARE ON THE RWY.' I SAID; 'YES SIR; I AM GETTING RIGHT OFF.' HE SAID; 'YOU DIDN'T THINK WE WOULD SEE YOU; DID YOU?' I SAID; 'NO SIR; I WAS SCARED TO DEATH WHEN I SAW WHERE I WAS; AND I WANTED TO GET OFF AS SOON AS POSSIBLE.' HE SAID; 'THAT'S OK.' I THOUGHT I HAD TURNED ON THE PARALLEL TXWY L. THERE WERE SO MANY GND AND BUILDING LIGHTS; AND MY EYES HAD NOT ADJUSTED TO THE SURROUNDINGS AFTER LNDG. ON FINAL APCH; THE CTLR HAD TOLD ME TO KEEP MY SPD UP AS THERE WERE NUMEROUS OTHER ACFT LNDG IN FRONT OF AND BEHIND US; MOSTLY JETS. THERE WERE ALSO SIMULTANEOUS LNDGS ON OTHER RWYS; INCLUDING 1 ACFT ON RWY 27L WHILE WE WERE ON FINAL APCH. I DON'T THINK ANOTHER ACFT HAD TO MAKE A GAR BECAUSE OF US; BUT THE POTENTIAL EXISTED FOR A VERY SERIOUS ACCIDENT. I AM NOT SURE IF THIS HAPPENS VERY OFTEN AT LARGE; BUSY ARPTS AT NIGHT; WHERE PLTS ARE UNFAMILIAR WITH THE ARPT; BUT IF SO; POSSIBLY A WARNING BY THE GND CTLR; FOR THE PLT TO ONLY TURN 30 DEGS SO AS NOT TO RETURN ONTO THE RWY.