AN MO21 PLT LNDG AT AN UNCTLED ARPT; DURING A FLY-IN; STOPPED HIS ACFT ON THE RWY THEN BACK TAXIED TO A TXWY HE OVERSHOT. A PA28 ON ITS TKOF ROLL MOVED TO THE R SIDE OF THE RWY AND EVADED THE RPTR.

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I LANDED ON RWY 24. HVY TFC VOLUME DUE TO FLY-IN. I PASSED A MID-FIELD TURN OFF BY ABOUT 300 FT. SINCE THE NEXT TURN OFF WAS 2000 FT AWAY AT THE END OF THE RWY I ANNOUNCED ON THE CTAF THAT I WOULD DO A 180 DEGS AND EXPEDITE MY CLRING THE ACTIVE RWY. AS SOON AS I MADE THE TURN I BECAME AWARE OF A PIPER ON THE LATTER STAGES OF ITS TKOF ROLL. I STEERED TO THE FAR R SIDE OF THE RWY AS THE DEPARTING ACFT MANEUVERED TO ITS R. I WAS IN A POS TO PULL ONTO THE GRASS IF NECESSARY; BUT THE PIPER WAS NOW AIRBORNE AND I DETERMINED THAT THE THREAT HAD PASSED. NO CALL WAS MADE BY THE DEPARTING ACFT ON THE CTAF. A CESSNA ON SHORT FINAL BEHIND ME MADE A GAR ALTHOUGH I'M NOT SURE IF HE WAS AWARE OF THE PIPER. THE LACK OF COM AS WELL AS AN APPARENT LACK OF SITUATIONAL AWARENESS ON THE PART OF THE CHEROKEE PLT FOR STARTING A TKOF WHEN I WAS STILL USING THE ACTIVE RWY WAS THE PRIMARY PROB. I ALSO THINK THAT IT WOULD HAVE BEEN MORE PRUDENT FOR ME TO HAVE EXITED THE RWY INTO THE GRASS IN CASE THE CHEROKEE HAD LOST CTL. I SUSPECT THE HIGH VOLUME OF TFC MIGHT HAVE LED TO THE CHEROKEE PLT'S RUSH TO GET AIRBORNE IN FRONT OF THE CESSNA ON SHORT FINAL WITHOUT VERIFYING THAT THE ACTIVE WAS CLR.