CPR LTT TAXIING TO RWY ACCIDENTALLY TAXIES ONTO A RWY. THERE WERE NO TXWY EDGE MARKINGS AND ALL SIGNS WERE BLANK BLACK SO IT WAS DIFFICULT TO KNOW WHERE TO TAXI.

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THE PROB AROSE WHEN ONE OF OUR PAX WAS INFORMED THAT HIS FAMILY WAS INVOLVED IN A SERIOUS AUTO ACCIDENT IN TYLER; TX. OUR ORIGINAL FLT PLAN WAS FROM AUSTIN; TX; TO LEXINGTON; KY. SO WE HAD TO GO BACK TO THE FBO AND RE- FILE PLANS TO TYLER; TX; AND LEXINGTON; KY. THERE WAS AN OBVIOUS PRESSURE TO GET OUR PAX TO TYLER AS SOON AS POSSIBLE. I OBTAINED OUR NEW CLRNC TO TYLER. I THEN PROCEEDED TO LOOK THE CHARTS OVER FOR OUR PLANNED DEP. THE CAPT HAD BOARDED AND WAS PREPARING FOR DEP. I HAD SOME TROUBLE FINDING TYLER ON THE CHART; SO I SPENT A FEW MOMENTS LOOKING THE CHART OVER. BY THAT TIME THE ENGS WERE RUNNING AND THE CAPT ASKED ME TO GET A TAXI CLRNC. AS WE STARTED TO ROLL FROM FBO I CALLED THE TWR FOR A TAXI CLRNC AS INSTRUCTED BY CLRNC DELIVERY. (WE WERE ALSO CONSIDERING RWY LENGTHS AND HAD DECIDED ON THE LONGEST ACTIVE RWY.) WE WERE CLRED TO TAXI TO RWY 17 VIA TXWYS A AND F HOLD SHORT OF RWY 31L. RWY 17 WAS TOO SHORT FOR OUR TKOF GROSS WT; SO WE ASKED TWR FOR RWY 31R. AS WE WERE TAXIING OUT OF THE RAMP THERE WERE NO NON-MOVEMENT AREA BOUNDARY MARKINGS OR DASHED/CONTINUOUS TXWY EDGE MARKINGS. NO TXWY OR RWY IDENT SIGNS. ALL OF THE SIGNS WERE BLACK WITH NO MARKINGS. SO AS I WAS LOOKING ON THE ARPT DIAGRAM TO CONFIRM OUR POS WE UNINTENTIONALLY TAXIED ONTO RWY 31L INSTEAD OF TXWY A. THE CAPT SAID 'OH NO I'M ON THE RWY' AND AS I LOOKED TO MY R I SAW A CHEROKEE 6 FLY OVERHEAD. WE TAXIED OFF THE RWY AND PROCEEDED AS NORMAL. FACTORS THAT I FEEL CONTRIBUTED TO THE SIT WAS THE URGENCY AND EXTRA PRESSURE TO GET OUR PAX TO TYLER AS SOON AS POSSIBLE. INADEQUATE ARPT MARKINGS AND TWR HANDLING GND AND FLT OPS SIMULTANEOUSLY AT A BUSY TIME. I BELIEVE THAT IF WE WOULD HAVE HELD OUR POS ON THE RAMP TILL WE WERE CLR ON WHERE WE WERE GOING WE WOULD HAVE NOT GOTTEN INTO THIS SIT.