AN ACR FLC FLYING A B757 INTO BWI RPTS CONFUSION DUE TO RAMP CONSTRUCTION AND MISUNDERSTANDING WITH GND CTL.

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AFTER A NORMAL LNDG ON RWY 10 AT BWI; I TURNED OFF THE RWY AT TXWY E. THE FO SWITCHED TO GND CTL WHO THEN INSTRUCTED US TO TAKE TXWY P 'ALL THE WAY AROUND' TO TXWY F TO THE GATE. THE CLRNC WAS SPOKEN QUICKLY BUT UNDERSTANDABLE. THE FREQ WAS SOMEWHAT CONGESTED. THE TURN FROM TXWY E TO TXWY P WAS CONFUSING TO ME AND I MOMENTARILY STOPPED THE AIRPLANE (CLR OF THE RWY) TO MAKE SURE I WAS GOING THE RIGHT WAY. STRAIGHT AHEAD WAS A VIRTUAL SEA OF LIGHTED BARRICADES. THERE WAS A TAXI SIGN FOR TXWY P OFF TO THE R; THE TURN TO THE L WOULD BE FAIRLY SHARP (FOR A B757) AND WAS POORLY LIT. AFTER A MOMENT OF DELIBERATION; I DECIDED THAT THE CTLR HAD TO HAVE MEANT A L TURN; AND I SLOWLY AND CAUTIOUSLY MADE THE TURN. UPON APCHING OUR GATE; WE DISCOVERED A BARRICADED AREA ON THE RAMP JUST OFF THE END OF OUR GATE. I AGAIN STOPPED THE AIRPLANE TO EVALUATE. WE THEN CLRED TXWY P AND HAD OUR GUIDE MAN DIRECT US IN AROUND THE BARRICADES. AFTER BLOCKING IN AT THE GATE; I WENT OUTSIDE TO DO A WALKAROUND. IN THE MEANTIME; THE FO TOOK A CALL AT THE GATE PODIUM FROM THE TWR SUPVR. HE WAS UPSET WITH US FOR STOPPING A COUPLE OF TIMES ON THE TXWYS. HE ALSO ADVISED THE FO TO CALL FOR PROGRESSIVE INSTRUCTIONS IF WE WERE 'CONFUSED.' IN MY OPINION; THEY ARE REALLY PUSHING THE LIMITS OF SAFETY WITH ALL THE CONSTRUCTION AT THAT ARPT -- ESPECIALLY FOR NIGHT OPS. A LIGHTED TAXI SIGN FOR TXWY P SHOWING THAT IT GOES L AND R FROM TXWY E WOULD BE HELPFUL. WE DID READ THE NOTAMS AND WE DID HAVE OUR TAXI DIAGRAMS OUT. IT WAS STILL HARD TO SEE; WITH ALL THAT CONSTRUCTION AND POOR LIGHTING.