A COMMERCIAL FIXED WING LTT TAXIING IN THE TERMINAL GATE AREA INADVERTENTLY TAXIED ONTO A ROADWAY WHEN CONFRONTED WITH RAMP CONGESTION.

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TURNED E ON TXWY C OFF TXWY Q AND WAS CUT OFF BY ACR Y PUSHING BACK TAIL E ONTO TXWY C. WHEN WE TOLD GND THAT WE WERE HOLDING NOSE-TO-NOSE WITH ACR Y; HE TOLD US TO TAXI FORWARD TO TXWY P AND GO TO TXWY B AND TO EXPEDITE. I TAXIED FORWARD LOOKING THROUGH THE TUG'S LIGHTS AND TURNED R ONTO WHAT I THOUGHT WAS TXWY P. I WAS ON IT WHEN I REALIZED IT WAS A ROADWAY! I STOPPED; BUT IT SOON BECAME APPARENT THAT A B747 CLRING RWY 25R WAS UNABLE TO CLR THE RWY WITH US IN OUR POS. THERE WAS AN ACFT IN POS ON RWY 25R; SO WE WERE HAVING A DEFINITE IMPACT ON LAX OPS. I SAW THAT IF I PROCEEDED FURTHER ON THE ROADWAY; I WOULD BE ABLE TO REACH TXWY B AND GET OUT OF THE B747'S WAY. I COULD SEE NO TFC; OBJECTS OR TAXI LIGHTS TO STOP OUR PROGRESS; SO I WENT. WE DID NOT HIT; TOUCH; OR AFFECT ANYTHING AS WE CROSSED OVER TO TXWY B. (AN HR LATER; AN OP VEHICLE CHKED THE AREA AND FOUND NO DAMAGE.) WE TAXIED TO OUR GATE UNEVENTFULLY AND CALLED THE TWR. HE SAID 'NO HARM; NO FOUL.' GOT TO BE MORE CAREFUL TAXIING!