ACR X RWY INCURSION HAD NMAC LTSS FROM PA32 ON TKOF. SYS ERROR.

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ARC X CALLED ORF GND CTL FOR TAXI. GND SAID: 'TAXI TO RWY 5' AND WE ACKNOWLEDGED. APCHING INTERSECTING RWY I LOOKED L; STATED 'CLR L;' FO LOOKED R AND STATED 'CLR R.' I LOOKED BACK TO THE L ONCE MORE AND SAW A PIPER SARATOGA ABOUT 200 FT AWAY JUST ROTATING FOR TKOF! I IMMEDIATELY APPLIED BRAKES AND STOPPED ABOUT 15 FT FROM THE RWY EDGE WHILE MYSELF AND FO WATCHED THE SARATOGA PASS FROM L TO R; REACHING A HT OF ABOUT 10 FT WHEN DIRECTLY IN FRONT OF US. GND CTL SAID NOTHING UNTIL I RESTATED OUR TAXI CLRNC FOLLOWED BY THE FACT WE WERE HOLDING SHORT OF RWY 32 DUE TO TFC TAKING OFF IN FRONT OF US. GND REPLIED 'HOLD YOUR POS;' FOLLOWED A MIN LATER WITH FURTHER TAXI CLRNC AND AN APOLOGY. MORAL: BE VIGILANT! EXPECT OTHER TFC TO BE THERE UNTIL YOU REALLY LOOK AND MAKE SURE OTHERWISE. DON'T GET COMPLACENT BECAUSE SOME TFC CAN BE HARD TO SEE -- LOOK TWICE! (THAT'S WHAT SAVED US!) ALSO WHEN TAKING OFF; TURN ON ALL LIGHTS POSSIBLE; OUR CONFLICT TFC DIDN'T HAVE A LNDG LIGHT ON AND MIGHT'VE HELPED. REMEMBER THAT ATC IS HUMAN TOO AND MAY MAKE A MISTAKE ONCE IN A WHILE!