TAXIING B757 CROSSES PAD FOR ONE RWY BUT ENTERS ACTIVE RWY TXWY AT INTXN FORCING GAR.

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LOCATION: RWY 27L PAD AT ORD. TAXI CLRNC TO RWY 22L VIA TXWY B AND TXWY D. APCHING RWY 27L PAD TWR TOLD US WE COULD CUT DIAGONALLY ACROSS THE RWY 27L PAD AND WE WERE ASKED IF WE COULD ACCEPT AN IMMEDIATE TKOF; WITH AN ACFT ON 1 1/2 MI FINAL. I NORMALLY SHY AWAY FROM ACCEPTING IMMEDIATE TKOF CLRNCS. BUT WE HAD COMPLETED THE CHKLIST. COMPLETED THE BRIEFING. THIS WAS OUR FOURTH TRIP TOGETHER THIS MONTH; AND WE WERE RUNNING 25 MINS LATE; DUE TO A GATE CHANGE AND LATE BOARDING PAX. SO; I ACCEPTED THE IMMEDIATE TKOF CLRNC. UNFORTUNATELY; AS I CUT ACROSS THE PAD; INSTEAD OF OUR NORMAL ROUTING OF SQUARING OFF THE TURN; I HEADED FOR RWY 22L INTXN Q; INSTEAD OF FULL LENGTH FROM TXWY D. THE FO AND TWR CAUGHT MY ERROR AT THE SAME TIME; BUT I WAS TOO FAR INTO INTXN Q TO ENABLE A TURN BACK INTO THE RWY 27L PAD. BECAUSE I HAD ENCROACHED INTO THE CLEARWAY FOR RWY 27L; TWR TOLD THE ACFT ON FINAL TO GAR; AND THEN TOLD US TO TAXI ONTO RWY 22L AND EXIT DOWNFIELD. I EITHER DIDN'T HEAR THE PART ABOUT DOWNFIELD; OR IT DIDN'T REGISTER IN MY MIND; AND I TURNED L ONTO THE RWY; INSTEAD OF R; TO CLR THE RWY IN THE MOST EXPEDITIOUS MANNER AT TXWY D. THIS KEPT ME IN THE CLR ZONE FOR RWY 27L; AND CAUSED ANOTHER ACFT TO GAR; NOT A GOOD DAY. FACTORS: BECAUSE WE LEFT THE GATE 26 MINS LATE; I WAS PROBABLY SUBCONSCIOUSLY HURRYING. I ACCEPTED AN IMMEDIATE TKOF CLRNC WHEN I WAS STILL OVER 1000 FT FROM THE HOLD SHORT; CAUSING ME TO RUSH FOR THE RWY AFTER THE ERROR WAS COMMITTED. IT SEEMED LOGICAL TO BACK-TAXI AND EXIT THE RWY IN THE MOST EXPEDITIOUS MANNER; RATHER THAN TAXI DOWN THE RWY 1800 FT TO TAKE A REVERSE HI SPD; SO I APPARENTLY HEARD WHAT I EXPECTED TO HEAR; NOT WHAT WAS ACTUALLY SAID. ALTHOUGH THERE IS SIGNAGE AT BOTH INTXNS FOR RWY 22L; AND THE INTXN FOR RWY 27L; THE AREA IS VERY CONFUSING; AND IF YOU HURRY THROUGH THIS AREA; YOU ARE ASKING FOR TROUBLE.