TAYLORCRAFT FORCED TO LEAVE RWY WHEN BACK-TAXIING DUE TO LNDG TFC HITTING SIGN IN GRASS AREA.

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DURING BACK-TAXI FOR A DEP ON RWY 23 (FLT OF 4) ACFT SPOTTED ON SHORT FINAL FOR RWY 23. THE 3 REMAINING ACFT MADE R TURN ONTO GRASS STRIP BTWN RWY AND ROAD TO CLR RWY FOR LNDG TFC. THE LAST OR TRAIL ACFT ALSO TURNED OFF RWY TO THE R AND CONTACTED A SIGN. SAFETY CONCERNS MUST INCLUDE PLT AND PAX ALONG WITH AUTO AND PEDESTRIANS. (NOTE: NO TXWY EXISTS.) CONTRIBUTING FACTORS: 1) SIGN WAS POSTED VERY LOW; TOP OF SIGN APPROX 40 INCHES (LOWER THAN DOT STANDARDS?). 2) SIGN WAS PLACED PARALLEL TO BOTH RWY AND ROAD. THIS MAKES SIGN VISIBLE FROM 90 DEGS THROUGH 45 DEGS; APPROX 3 FT WIDE; BUT THROUGH 180 DEGS SIGN IS ONLY APPROX 1/8 INCH WIDE; INSUFFICIENT. CORRECTIVE ACTION: SIGN SHOULD BE PLACED AT EYE LEVEL OR DOT STANDARD (REF STOP SIGN; ETC). PLACE SIGN ON OTHER SIDE OF ROAD. THIS PLACES SIGN OUT OF REACH OF BOTH ACFT AND AUTO. SIGN SHOULD ALSO BE (2) 90 DEG SIGNS PLACED AT 45 DEGS TO ROAD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT ORIGINALLY THIS WAS A TXWY AND THE POWERS THAT BE JUST VOTED TO MAKE IT A ROAD FOR ACCESS TO HOUSES WHICH HAVE BEEN BUILT BEYOND THE ARPT. IT CAN NO LONGER BE USED FOR A TXWY. THERE ARE 4 SIGNS; AT THE ENTRY WAY; THE EXIT AND 2 PLACES IN BTWN. AS INDICATED THEY ARE NOT STANDARD AND TOO LOW FOR GOOD VISUAL CONTACT. THERE IS QUITE A BIT OF TFC IN THE AREA AS IT IS A SETTING FOR SEVERAL FESTIVALS DURING THE YR. THIS MAKES IT VERY INCONVENIENT FOR LNDG AND DEPARTING TFC COORD DUE TO HAVING TO BACK TAXI. THE LIGHTS HAVE BEEN CHANGED TO RECESSED LIGHTS DUE TO VANDALISM OF THE FRANGIBLE RWY LIGHTS. ANALYST SPOKE TO AN FAA ARPT CERTIFICATION SAFETY INSPECTOR REGARDING THE 'NOT FAA APPROVED' INDICATION IN THE ARPT FACILITY DIRECTORY. HE INDICATED IT IS BECAUSE OF THE LIGHTING; NOT THE ARPT ITSELF. IT REFS THE MIRL LIGHTING WHICH IS INDICATED AS NONSTANDARD. RPTR OF COURSE WOULD LIKE TO SEE STANDARDIZATION OF THE SIGNAGE TO COMPLY WITH FAA REGS; AND RELOCATION TO THE OTHER SIDE OF THE ROAD.