D328 FO BRINGS TO PIC ATTN THAT HE IS APCHING THE WRONG RWY WHICH IS ATTRIBUTED TO CLE CONSTRUCTION AND CONFUSING TXWY SIGNAGE.

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WE WERE IN CLEVELAND FOR THE SECOND TIME THAT DAY; SITTING AT THE GATE WHEN I CALLED FOR TAXI CLRNC. EARLIER WE WERE GIVEN THE CODED VIOLET RTE. THIS TIME IT WAS DARK AND WE WERE GIVEN TAXI TO RWY 5L VIA TXWY W; TXWY L; HOLD SHORT OF TXWY R. WE STARTED OUT OF OUR GATE AT THE END OF OUR CONCOURSE. NEARBY THERE WAS SOME CONSTRUCTION BARRICADES ON TXWY W. THE CAPT AND I BEGAN LOOKING FOR THE SIGNAGE FOR TXWY W AND TXWY L. THE SIGNS FOR TXWY W; TXWY L AND TXWY J WERE KIND OF CONFUSING IN THE DARK. THE CAPT SAID HE HAD IT AND CALLED FOR THE TAXI CHKLIST. I BEGAN RUNNING THE CHKLIST AND WHEN I LOOKED UP; I REALIZED HE WAS ON TXWY W HEADED FOR RWY 5R; HE HAD MISSED TXWY L AND WAS THINKING THAT RWY 5R WAS TXWY L. HE BEGAN TO REALIZE HIS MISTAKE WHEN I LOOKED UP AND TOLD HIM TO STOP. I POINTED OUT AN AIRPLANE THAT WAS TAKING OFF ON TXWY 5R. ABOUT THIS TIME; THE GND CTLR SAW US AND TOLD US TO TURN AROUND AND TAXI DOWN TXWY L TO RWY 5L HOLDING SHORT AT TXWY K. I FIRMLY BELIEVE WE DID NOT CROSS INTO THE RWY ENVIRONMENT AT ANY TIME; BUT THE SIT WAS VERY CONFUSING IN THE DARK. WITH TXWY W UNDER CONSTRUCTION SO CLOSE TO US; AND THE ACTUAL RTE ON TXWY TO TXWY L SO SHORT; I BELIEVE THERE WOULD HAVE BEEN LESS CONFUSION IF WE HAD JUST BEEN GIVEN CLRNC TO TAXI TO RWY 5L VIA TXWY L; HOLDING SHORT OF TXWY R. THE SIGNAGE THERE IS ALSO CONFUSING AS TO WHERE TXWY J; TXWY L; AND TXWY W JOIN AND CONVERGE. NEXT TIME I WILL WATCH MY CAPT UNTIL WE ARE ESTABLISHED ON TXWY L AND HAVE A STRAIGHT SHOT OF OUR TAXI BEFORE I START RUNNING A CHKLIST.