A CPR FLC IN AN MU3 OVERSHOT A TXWY AND CROSSED AN ACTIVE RWY WITHOUT AUTH.

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AFTER LNDG ON RWY 18R AND USING HIGH SPD TXWY E4; WE REQUESTED AND RECEIVED PROGRESSIVE TAXI INSTRUCTIONS TO AN FBO LOCATED ON THE E SIDE OF THE ARPT. THE GND CTLR INSTRUCTED US TO TURN L ON TXWY E AND R ON TXWY A. NEITHER ONE OF US SAW THE SIGN FOR TXWY A; AND SINCE THE CTLR'S CLRNC DID NOT INCLUDE A 'HOLD SHORT OF RWY 23' REQUEST; WE ASSUMED THAT WE HAD AUTH TO CROSS RWY 23. WE CONTINUED TAXIING N ON TXWY E; BELIEVING THAT WE WOULD SOON SEE A SIGN FOR TXWY A ON OUR R. THE CTLR THEN INSTRUCTED US TO TURN R ON TXWY M AND TO HOLD SHORT OF RWY 23 AT TXWY B; DUE TO LNDG TFC. ALL INSTRUCTIONS WERE ACKNOWLEDGED BY US. AFTER ARRIVING AT THE FBO; WE WERE ASKED TO CONTACT THE CTL TWR BY PHONE. THE CHIEF CTLR INFORMED ME THAT WE HAD CAUSED AN ACTIVE RWY INCURSION; WITH TFC ON FINAL APCH. THIS AIRPLANE DID NOT LAND UNTIL AFTER WE HAD ARRIVED; AND WERE HOLDING SHORT OF RWY 23; AS TXWY B (TXWY A4 STARTS ON THE S SIDE OF RWY 23). I APOLOGIZED TO THE CHIEF CTLR AND INFORMED HIM THAT NEITHER ONE OF US HAD SEEN THE SIGN FOR TXWY A. HE SUGGESTED THAT I CALL ARPT OPS TO CHK THE STATUS OF THE LIGHTS AT TXWY A. ARPT OPS SAID THEY WOULD CHK THE LIGHTS AS SOON AS THEY COULD. DARKNESS; UNFAMILIARITY WITH THE ARPT; AND PERHAPS RELYING TOO MUCH ON THE 'STEP-BY-STEP' PROGRESSIVE TAXI INSTRUCTIONS FROM THE GND CTLR; CONTRIBUTED TO US INADVERTENTLY XING THIS RWY. EVEN THOUGH A HAZARDOUS SIT DID NOT OCCUR; I MUST; AND WILL; ACKNOWLEDGE THAT THE POTENTIAL WAS THERE. I WILL RECOMMIT MYSELF TO GREAT CAUTION AND VIGILANCE WHEN TAXIING; EVEN WHILE 'ON PROGRESSIVE;' WHILE AT BUSY; UNFAMILIAR ARPTS WITH MULTIPLE; INTERSECTING RWYS. FOR YOUR CONVENIENCE; I HAVE INCLUDED A COPY OF THE CLT ARPT DIAGRAM/LAYOUT.