RWY INCURSION WHEN AN MD11 FLT CROSSES RWY 7L WITHOUT CLRNC AT LAX; CA.

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DURING TAXI FROM THE N RWY COMPLEX TO THE CARGO COMPLEX ON THE S SIDE OF THE ARPT USING THE 'BRIDGE' RTE (APCHING RWY 7L AREA) WE WERE INSTRUCTED TO USE TXWY B AND 'HOLD SHORT OF TXWY U.' AT A POINT ON TXWY B CLOSE TO B16; THE FO SAID (TRYING TO BE HELPFUL) 'IT WILL BE THE SECOND ON THE R.' AT THE SAME TIME; A VERY BUSY 'TWR' WAS CLRING ANOTHER 'COMPANY' FLT; WHICH HAD JUST ROLLED OUT ON RWY 25R TO EXPEDITE ACROSS THE L RWY AS WELL AS CLRING AN ACR FLT TO EXPEDITE ACROSS RWY 25L (AFTER HOLDING SHORT OF RWY 25L ROLLOUT END ON TXWY U). WHILE I WAS SORTING OUT THE BUSY COMS IN MY MIND AND ANTICIPATING THAT THE CTLR WOULD WANT US TO BE WHERE OTHER ACR HAD BEEN HOLDING SO AS TO GET US CLR OF THE LNDG RWYS; I FAILED TO HOLD SHORT OF TXWY U BUT TURNED INSTEAD ONTO TXWY U. BY THE TIME I REALIZED THE ERROR; THE NOSE OF OUR ACFT HAD ENTERED RWY 7L. TO MINIMIZE ANY CONFLICT; I CONTINUED ACROSS RWY 7L AND STOPPED. (I HAD BEEN LOOKING EASTERLY AND KNEW THAT NO TFC WAS LNDG ON THAT RWY; AND IN CONVERSATION WITH THE TWR SUPVR; HE CONFIRMED THAT THERE HAD BEEN NO LOSS OF SEPARATION). HOWEVER; WE HAD STOPPED TOO SOON AND WERE SUBSEQUENTLY REQUESTED TO MOVE UP TO THE HOLD LINE OF RWY 7R TO PROVIDE FULL CLRNC OF RWY 7L. CAUSE: COM OVERLOAD COUPLED WITH A DESIRE TO KEEP THE TFC MOVING. SUGGESTIONS: CONTINUE THE EMPHASIS TO CREWS TO FOCUS ON THE CLRNC. SUPPLEMENTAL INFO FROM ACN 538875: THE CAPT STATED HE THOUGHT HE WAS 'CLRED TO CROSS' WHEN IN FACT IT WAS ANOTHER COMPANY ACFT; FURTHER DOWN THE TXWY; THAT WAS CLRED. BY THE TIME I REALIZED HE WASN'T GOING TO STOP (FO) WE WERE ALREADY BEYOND THE HOLD SHORT LINE. COMMENT: IF YOU'RE NOT SURE OF YOUR CLRNC; ASK!