HIGHLIGHTING A SINGLE RWY INCURSION; A RPTR COMMENTS ON A RECURRING PROB OF PLT CONFUSION AND INCURSION INCIDENTS AT CAHOKIA/ST LOUIS; IL THAT HE BELIEVES ARE THE RESULT OF POOR SIGNAGE ON THE ARPT.

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ACFT X WAS GIVEN A TAXI RTE TO THE FBO HE REQUESTED. ACFT DEVIATED FROM ASSIGNED RTE AND ENTERED ONTO ANOTHER ACTIVE RWY. ANOTHER ACFT WAS SENT AROUND TO AVOID LOSS OF SEPARATION. WHILE ATTEMPTING TO EXIT TO RWY 12R; PLT STATED HE COULD NOT CLR THE RWY WITHOUT SHUTTING DOWN AND PUSHING THE ACFT AWAY FROM THE LIGHT HE WAS UP AGAINST. OTHER ACFT WERE DIVERTED TO OTHER RWYS UNTIL ACFT X WAS CLR OF RWY 12R. ACFT X HAD LANDED ON RWY 12L. ARPT SIGNAGE IS CONSIDERED LACKING AT THE ARPT AND HAS CAUSED SEVERAL PROBS IN THE PAST. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: DURING CALLBACK THE RPTR'S COMMENT INDICATED THAT THE ARPT IS PRIVATELY OWNED. HOWEVER; IT DOES HAVE ACCESS TO FEDERAL FUNDS FOR IMPROVEMENTS. IN RECENT YRS SOME OF THAT MONEY HAS BEEN AVAILABLE. HOWEVER; THE IMPROVEMENTS IN NEEDED SIGNAGE HAVE NOT BEEN MADE ON ALL AREAS OF THE ARPT. THE N AND W SIDE OF THE ARPT HAVE NEW SIGNS; BUT IN THE AREAS BTWN THE RWYS 12 L AND R THERE ARE NONE OR INADEQUATE SIGNS WHICH HAS LED TO SEVERAL PLTS TAKING THE WRONG TXWY OR GETTING ON TO RWY 12L/30R BY MISTAKE AND WITHOUT CLRNC. WHILE NOT SURE; THE RPTR THINKS THAT THERE HAS RECENTLY BEEN AN EFFORT MADE TO INSTALL TEMPORARY SIGNS.