A C210 COMMERCIAL PLT CROSSES RWY 34 WITHOUT CLRNC AT PDK; GA.

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ON JAN/XA/01; AT APPROX XA30 AM I LANDED A C210 ON RWY 2R AT PDK. AT THAT TIME; I WAS ON OFFICIAL UNITED STATES GOV BUSINESS. I TAXIED OFF THE RWY ONTO TXWY D AND STOPPED THE AIRPLANE. I THOUGHT THE TWR CTLR HAD TOLD ME TO SWITCH TO THE GND CTL FREQ; BUT WASN'T SURE SO I CALLED THE TWR AGAIN ADVISING I WAS HOLDING FOR INSTRUCTIONS. THE TWR CTLR TOLD ME TO CROSS RWY 2L AND CONTACT GND. AT THE TIME; I WAS HOLDING ON TXWY D ADJACENT TO THE POINT ON MY IMMEDIATE L WHERE RWYS 2L AND 34 INTERSECT; SO I PROCEEDED TO CROSS THE RWYS TO A HOLDING POINT AT TXWY A WHERE I CONTACTED GND FOR FURTHER TAXI CLRNC. THE GND CTLR CLRED ME TO TAXI TO THE W RAMP OF THE ARPT; BUT ADVISED ME THAT I HAD CROSSED RWY 34 WITHOUT CLRNC TO DO SO. THE GND CTLR FURTHER TOLD ME TO PLEASE BE MORE CAREFUL; ETC. I REMEMBER BEING CONFUSED BECAUSE I THOUGHT I HAD CROSSED AT THE POINT WHERE THE RWYS INTERSECTED AND ASSUMED THE CLRNC WAS GOOD TO CROSS BOTH RWYS. AFTER SHUTDOWN I INITIATED A CALL TO THE TWR (I WAS NOT REQUESTED TO DO SO) AND SPOKE TO THE TWR MGR. HE ADVISED ME THAT THE CTLR HAD WANTED ME TO CONTINUE STRAIGHT AHEAD ON TXWY D TO CROSS RWY 2L AND THEN HOLD SHORT OF RWY 34 AND CONTACT GND. I EXPLAINED WHY I HAD CROSSED WHERE I HAD; AND TOLD HIM I BELIEVED I HAD A VALID CLRNC TO CROSS AT THE RWY INTXN BARRING SOMETHING IN THE WAY OF MORE DEFINITIVE INSTRUCTION TO THE CONTRARY. WE BOTH AGREED THAT THE TXWYS AND RWYS AT PDK OFTEN CONFUSE PLTS AS TO THEIR LOCATION ON THE FIELD WITH RESPECT TO TAXI AND HOLD INSTRUCTIONS. THE TWR MGR ADMITTED THERE IS A HIGHER THAN NORMAL INCIDENCE OF TAXI ERRORS AT PDK. RWY/TXWY MARKINGS AT PDK HAVE RECENTLY BEEN IMPROVED; BUT THE NUMEROUS XING RWYS AND ADJACENT TXWYS STILL CREATE CONFUSION BOTH DAY AND NIGHT.