AN ACR B737 FLC CROSSED THE HOLD LINE FOR RWY 9L ON TXWY H. THE CAPT COMPLAINS THAT THE HOLD LINES WERE THIN AND THEY TENDED TO BLEND INTO THE COLOR OF THE TXWY.

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ACFT LANDED ON RWY 13; TURNED L ON TXWY H; AND WAS INSTRUCTED TO HOLD SHORT OF RWY 9L. I CONFERRED WITH FO AND CHKED ACARS FOR GATE MESSAGE (THE ACARS WAS SHOWING NO-COM DURING THE FLT); AND STOPPED WELL SHORT OF RWY 9L (APPROX 80-100 FT SHORT OF RWY BOUNDARY). TWR ASKED US IF WE WERE ON OPPOSITE SIDE OF HOLD SHORT LINE. WE LOOKED ABEAM AND FORWARD OF ACFT AND SAW NO LINE AND TOLD THE TWR SO. DUE TO TWR POS TO OUR ACFT (DIRECTLY BEHIND US) THE CTLR COULD NOT VERIFY A SAFE DISTANCE FROM US TO RWY AND TOLD A COMMUTER ACFT ON FINAL TO GAR. THEN WE WERE CLRED TO CROSS RWY 9L AND TAXIED TO GATE. ALTHOUGH I STOPPED WELL SHORT OF THE RWY; I MUST HAVE HAD MY EYES IN THE COCKPIT AS WE WERE SLOWING TO STOP. HAD I SAW THE LINE; THE TAXI SPD WOULD NOT HAVE PRECLUDED A NORMAL COMFORTABLE STOP OF THE ACFT. ON TAXI OUT FOR THE NEXT FLT; I NOTICED THAT THE HOLD SHORT LINES ARE THIN; AND DO NOT CONTRAST GREATLY WITH TXWY SURFACE. AT 60-80 FT AWAY THEY ARE DIFFICULT TO SEE WITH SUNLIGHT BRIGHTENING THE TXWYS. I SHOULD HAVE BEEN LOOKING FOR THE LINE; AND NOT HAVE ASSUMED IT WOULD BE WHERE I NORMALLY MIGHT HOLD SHORT.