RV9A DISCOVERED OBSTRUCTION ON RWY DURING TKOF ON UNCONTROLLED ARPT. TKOF WAS CONTINUED; OVERFLYING OBSTRUCTION.

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MY PREFLT BRIEFING STATED THAT THE E TXWY WAS CLOSED; NO REASON GIVEN. AFTER RUN-UP; I WAS READY TO DEPART RWY XX; THE CALM WIND RWY THAT IS ABOUT 5100 FT LONG. A LIGHT TWIN HAD JUST LANDED ON XY. THERE WAS SOME ACTIVITY ON THE S HALF OF THE E TXWY; TOO FAR AWAY TO IDENT AND OF NO OBVIOUS INTEREST SINCE I KNEW THE E TXWY WAS CLOSED. THE RWY WAS CLR AND I ANNOUNCED MY DEP AND MY INTENDED TURN TO THE N. DURING THE TKOF ROLL; I DISCOVERED THAT VEHICLES (OR A DISABLED ACFT) HAD MOVED ONTO THE RWY; APPARENTLY TO CROSS TO THE W SIDE OF THE FIELD. SINCE I COULD LIFT OFF SEVERAL THOUSAND FT BEFORE THE OBSTRUCTION AND CLR IT BY SEVERAL HUNDRED; I CONSIDERED A TKOF SAFER THAN A HIGH SPD ABORT AND CONTINUED MY TKOF. NO ANNOUNCEMENT OF ANY KIND HAD BEEN MADE ON THE CTAF. IT IS CERTAIN THAT MY RADIO WAS WORKING PROPERLY SINCE I LISTENED TO THE ASOS BEFORE SWITCHING FREQS AND I CONFIRMED THE CORRECT FREQ AND WAS SET IMMEDIATELY AFTER TKOF. THE RWY WAS CLR WHEN I TAXIED INTO POS AND IT ID DIFFICULT TO SEE WHAT I COULD HAVE DONE OTHER THAN CONTINUE OR ABORT. A SHORT BUT CLR ANNOUNCEMENT BY THE OBSTRUCTING PARTY WOULD HAVE BEEN HELPFUL.