LGT HAD CLOSE CALL WITH ANOTHER LGT ON RAMP PRIOR TO ENTERING TAXIWAY.

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CLRED TO TAXI AWAY FROM PUSH POSITION; RIGHT TURN ON THE INNER TAXIWAY BEHIND A WDB AND FOLLOW IT TO 13R. NOTE: WE SHARE AN ALLEY WITH ANOTHER ACR BETWEEN TERMINALS NEAR INTXN MA. USUALLY A CLRNC TO TAXI IS FOLLOWED BY A COMMENT: GIVE WAY TO; INBOUND; OR L; OR R; OR M/A; OR N THEN FOLLOW THE COMMENT APPLIED TO WDB. NO OTHER ACFT MENTIONED. AFTER WDB PASSED MA AND WE MOVED UP FROM OUR POSITION TOWARDS MA AND OBSERVED LGT Y TURNING INBOUND AT MA FROM THE OUTER AT A GOOD RATE WITH NO SIGNS OF SLOWING. WE STOPPED OUR ACFT. LGT Y CONTINUED IN TO ACR TERMINAL WITHOUT SLOWING; PASSING HIS LEFT WING TIP ABOUT 3' IN FRONT OF OUR RADOME. WHILE WE REALIZE GND DOESN'T USUALLY CTL THE ALLEY; IT IS SIGNIFICANT THAT WE DIDN'T KNOW WHERE LGT Y PARKED. NO MENTION WAS MADE OF LGT Y BEING INBOUND AT MA AND SINCE WE WERE UNDERWAY; LGT Y MADE NO ATTEMPT TO SLOW DOWN IN SPITE OF FACT WE WERE A POTENTIAL CONFLICT AND 3' MORE AND MA WOULD HAVE BEEN BLOCKED BY 2 ACFT NOSE TO NOSE. PRUDENCE AND COURTESY SHOULD BE DISPLAYED BY ALL CREWS!