PLT OF AN AC500 LANDS WITH TFC IN THE PATTERN FOR AN INTERSECTING RWY AND TURNS OFF AT THE TXWY TO AVOID THE SECOND ACFT. THE TXWY MARKED TURNS OUT TO BE THE RWY ON WHICH THE ACFT IS LNDG.

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IN PREPARATION FOR A VFR FLT FROM CRG TO SGJ; I READ THE CAPTION IN THE GOV SE AFD FOR SGJ; AS I HAD NOT BEEN THERE IN A WHILE. I NOTICED THAT RWY 2 WAS OPEN AGAIN; BUT ONLY DURING DAYLIGHT ACCORDING TO THE AFD. LOOKING AT THE DISTANCE AVAILABLE ON THIS RWY AND RWY 6; I PLANNED ON USING RWY 31 AS IT IS MUCH MORE SUITABLE FOR THE TYPE OF ACFT I WAS FLYING; AN AC500 COMMANDER. I OBTAINED AN ARPT ADVISORY FROM UNICOM AND WAS TOLD RWYS 31 AND 2 WERE ACTIVE. I HEARD A CHEROKEE IN L PATTERN FOR RWY 2 AND I ENTERED A L DOWNWIND FOR RWY 31; MAKING RADIO CALLS AND SIGHTING THE OTHER TFC FOR RWY 2. AS I TURNED FINAL; I SAW THE CHEROKEE STILL ON DOWNWIND AND ELECTED TO LAND AND CLR THE INTXN BEFORE HE LANDED ON RWY 2. AS I LANDED AND PASSED RWY 6 INTXN; I LOOKED L AND SAW THE CHEROKEE TURNING FINAL. I MADE A L TURN ON THE NEXT MARKED TXWY; MARKED WITH A STANDARD SIGN ON THE R SIDE AS 'D3.' A SOLID YELLOW LINE GOES DOWN THE MIDDLE; AND IS BORDERED BY BLUE LIGHTS; WITH THE APPROPRIATE HOLD BARS PAINTED ON IT; BUT NONE ON RWY 31 TO INDICATE YOU ARE APCHING A RWY. THIS TXWY D3 IS ACTUALLY RWY 2 BUT IS MARKED AS A TXWY. ONLY FROM THE AIR CAN YOU SEE THE RWY NUMBERS! ALL THE OTHER INDICATORS ARE OF A TXWY. THIS IS AN EXTREMELY HAZARDOUS SIT; AS THERE IS NO NOTE IN THE GOV CHARTS OR DIRECTORIES OR NOTAMS TO INDICATE THAT RWY 2 AND TXWY D3 ARE THE SAME PIECE OF PAVEMENT DURING THE DAY! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE HAS NOT HAD A CHANCE TO SPEAK WITH ANYONE AT THE ARPT REGARDING THE SIT. HE HAS SPOKEN TO OTHER PLTS WHO HAVE FLOWN TO THAT ARPT AND THEY INDICATE THAT THE RWY WAS CLOSED FOR A WHILE AND USED AS A TIEDOWN AREA; THEN OPENED AGAIN AND USED AS A RWY AND NOW IS USED AS A TXWY AT NIGHT. THAT IS WHY ALL THE TXWY MARKING AND LIGHTING IS IN PLACE. HOWEVER; THERE ARE NO MARKINGS TO INDICATE IT IS NOT TO BE USED AS A TXWY IN THE DAYTIME; BUT IS A RWY. THERE IS A RUMOR THAT RWY 2 WILL BE CLOSED. RPTR CONCURS THAT WOULD BE THE BEST SOLUTION; SINCE RWY 6 IS AVAILABLE AND IS SEVERAL HUNDRED FT LONGER THAN RWY 2. RPTR WAS REFERRED TO THE HOTLINE.