B757 USES WRONG TXWY TO DEPART RWY AT YVR (148 PT 60).

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TIME: XX04Z. ATC FREQ: 118.7. ATC FACILITY: YVR S TWR. LOCATION: RWY 26L YVR. ON LNDG ROLL RWY 26L; TWR INSTRUCTED US TO TURN L ON TXWY H. PF (CAPT) WAS JUST APCHING A DIAGONAL TXWY. HE USED MODERATE BRAKING AND TURNED R. AFTER HE WAS COMMITTED TO THIS INTXN TWR SAID WE WERE AT D2 AND NOT H; BUT GO AHEAD AND EXIT THERE SINCE THERE WAS TFC ON SHORT FINAL. HE ALSO COMMENTED D2 WAS WT RESTR -- THIS IS NOTED ON COMMERCIAL CHART 10-9 PAGE. CAPT UNDERSTOOD TWR WANTED AN IMMEDIATE EXIT FROM THE RWY WHICH IS WHY HE TURNED IN THE FIRST PLACE. DURING THE APCH BRIEF WE HAD DISCUSSED H AS THE DESIRED EXIT POINT. FACTORS WERE DARKNESS; HARD TO READ TXWY SIGNS; AND THE CTLR'S ILL-TIMED EXIT INSTRUCTIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: PLT STATED THAT ALL TAXI SIGNS FROM THE RWY ARE DIFFICULT TO SEE UNLESS YOU ARE IN THEIR CLOSE PROX. SIGNS ARE ADEQUATE FOR DAYTIME USE BUT NOT READABLE DURING TIMES OF DARKNESS. FOR NIGHTTIME USE; PLT STRONGLY SUGGESTS SIGN BE LARGER AND MORE BRIGHTLY LIT. CAPT COULD NOT IDENT TXWY SIGNS ANY BETTER THAN THE FO. HE USED HVY BRAKING TO MAKE THE TXWY HE THOUGHT HE SHOULD BE USING ONLY TO FIND HE WAS ON THE TXWY PRIOR TO THE TWR REQUEST.