ACFT CLRED TO LAND ON RWY 22R. LAHSO LIGHTS AT INTXN OF RWY 22R AND RWY 9L WERE FLASHING. CREW STOPPED ON RWY 22R; SHORT OF RWY 9L. FOLLOWING ACFT EXECUTED GAR.

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ORD WAS USING RWYS 14L/R AND RWYS 22L/R FOR LNDG WITH LAHSO'S IN EFFECT FOR RWYS 14L/R. DEPS WERE USING RWYS 22L/27L. OUR FLT RECEIVED LNDG CLRNC ON RWY 22R. THE CLRNC DID NOT INCLUDE HOLD SHORT INSTRUCTIONS. AFTER TOUCHDOWN; WE PLANNED TO VACATE THE RWY AT TXWY R. APCHING THE RWY 22R/9L INTXN; I NOTICED THE HOLD SHORT LIGHTS FLASHING (SINGLE ROW OF FLASHING WHITE LIGHTS DESIGNATING THE HOLD SHORT POINT) AND BROUGHT THE ACFT TO A STOP PRIOR TO THE INTXN. THE FO QUERIED THE TWR REQUESTING CLRNC TO CROSS RWY 9L. THERE WAS NO RESPONSE AND OBVIOUS CONFUSION. WITH A SECOND ATTEMPT TO RECEIVE A XING CLRNC BEYOND THE HOLD SHORT LIGHTS; THE TWR RESPONDED WITH A 'WHAT?' AND SUBSEQUENT INSTRUCTIONS FOR THE ACFT LNDG BEHIND US TO GO AROUND. CORRECTIVE ACTION: LEAVE THE FLASHING HOLD SHORT LIGHTS OFF WHEN LAHSO IS NOT IN USE. (NOT IN EFFECT FOR RWY 22R.) CHK ATIS HARD COPY. SUPPLEMENTAL INFO FROM ACN 436378: AFTER PARKING AT THE GATE; WE CALLED THE TWR ON THE PHONE. THEY SAID ANY TIME THERE ARE LAHSO OPS AT THE FIELD; THE FLASHING LAHSO LIGHTS ARE ILLUMINATED AT ALL TIMES ON ALL RWYS. THIS SEEMS CONFUSING TO ME. IT SEEMS THE PURPOSE OF THE LAHSO LIGHTS IS TO ALERT THE PLTS THE END OF THE USEABLE RWY IS AT THAT POINT. THE PLTS SHOULD NOT BE TRAINED TO GO THROUGH THEM SOMETIMES AND HOLD SHORT AT OTHERS. IF A PLANE IS INSTRUCTED TO LAND AND HOLD SHORT; THE LIGHTS SHOULD GO ON. IF NO SUCH CLRNC IS GIVEN; THE LIGHTS SHOULD STAY OFF. CONTINUOUS OP OF THE LIGHTS; REGARDLESS OF THE CLRNC; SEEMS TO BE NEGATIVE TRAINING. CALLBACK CONVERSATION WITH RPTR ACN 436173 REVEALED THE FOLLOWING INFO: THE PLT DESCRIBES THE LIGHTING AS ALTERNATING RED AND WHITE LIGHTS. THE ACR DOES NOT HAVE ANY DESCRIPTIVE MATERIAL ABOUT THIS SYS. WHEN HE SAW FLASHING RED AND WHITE LIGHTS AHEAD OF HIM HE STOPPED MORE ABRUPTLY THAN NORMAL. ON A TELEPHONE CONVERSATION WITH THE TWR LATER; THEY INDICATED THAT THERE WAS ONLY 1 ON/OFF SWITCH FOR ALL THE LIGHTING. THE TWR PERSONNEL SAID THEY DID NOT WANT TO BE BOTHERED; OR HAVE THE RESPONSIBILITY TO CTL INDIVIDUAL RWY LIGHTING.