CAPT OF A B727 MISSED TURNING ON A TXWY DURING TAXI AFTER LNDG RESULTING IN 1 ACFT SENT AROUND BECAUSE B757 LNDG AHEAD COULD NOT TURN OFF RWY DUE TO THE RPTR BLOCKING THE TXWY.

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LOCATION: TXWY B BTWN TXWY P AND RWY 17C. LANDED ON RWY 17L DFW. TAXIED W ON ER. INSTRUCTIONS WERE TO TURN R ON TXWY P; L ON TXWY A; HOLD SHORT OF RWY 17C. WE INADVERTENTLY PASSED TXWY A; AND FO ADVISED CAPT THAT WE PASSED TXWY A. WE WERE WATCHING AN ACR Y B757 WHO WAS ROLLING OUT LONG ON RWY 17C WITH AN ACFT ON SHORT FINAL. TWR TOLD ACFT Y TO EXPEDITE AND TAKE THE HIGHSPEED. BY THIS TIME CAPT HAD PASSED TXWY A BUT SLOWED SUFFICIENTLY TO TAKE TXWY B SHORT OF RWY 17C. ACR Y ROLLED UP TO TXWY B AND STARTED TO MAKE A L TURN ONTO TXWY B; BUT HE STOPPED PARTIALLY INTO TURN WHEN HE SAW US I SUPPOSE. TWR TOLD ACFT ON SHORT FINAL TO GAR SINCE ACR Y WAS STILL ON RWY 17C AT TXWY B. ACR Y THEN ROLLED FORWARD AND TURNED L ONTO TXWY A. WE ROLLED FORWARD ON TXWY B AND HELD SHORT OF RWY 17C. THIS ENDED THE CONFLICT AND WE TAXIED ACROSS THE RWYS SHORTLY THEREAFTER. OUR FAILURE TO TURN ONTO TXWY A FROM TXWY P WAS DUE TO WATCHING ACR Y'S LONG ROLLOUT AND THE POTENTIAL FOR A GAR WHICH WAS DEVELOPING. ALTHOUGH THIS DEVELOPING SIT DID NOT DIRECTLY INVOLVE US; WE ALLOWED IT TO DISTRACT US ENOUGH TO MISS THE TURN ONTO TXWY A.