RWY INCURSION DUE TO NEW RELOCATED RWY THRESHOLD.

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A RECENT REQUIREMENT FOR ARPTS SIMILAR TO LINCOLN MUNICIPAL ARPT; NE; REQUIRES 1000 FT BTWN ALL RWY ENDS AND ROADS. DURING CONSTRUCTION WORK ON RWY 17L/35R AT LNK; THE LNK ARPT AUTH WAS TOLD BY THE FAA TO COME INTO COMPLIANCE WITH THIS REQUIREMENT WHICH RESULTED IN A RELOCATED THRESHOLD OF APPROX 400 FT AT THE S END OF RWY 17L/35R. CONCURRENT TO THE RE-OPENING OF RWY 17L/35R THIS RELOCATED THRESHOLD WAS MARKED SIMILAR TO A TXWY. ALTHOUGH THERE APPARENTLY EXISTS A HOLD SHORT LINE WHICH SHOULD PREVENT PLTS FROM ENTERING THIS AREA WITHOUT CLRNC; THE NEW MARKINGS HAVE THE PLTS CONFUSED BELIEVING THE NEW HOLD LINE IS ON THE RELOCATED THRESHOLD. ON DEC/TUE/94 A CESSNA CENTURION PLT STARTED TO TAXI ONTO THE RELOCATED THRESHOLD WHILE ASKING ME (LCL CTL) IF HE SHOULD TAXI UP TO THE HOLD LINE ON THE RELOCATED THRESHOLD AND THEN ADVISE HE IS READY. THIS PLT HAD ALREADY CROSSED THE HOLD LINE WHICH WOULD PROTECT EVEN THE THRESHOLD. I LEARNED LATER ON DEC/XX/94 THAT SIMILAR EVENTS HAVE OCCURRED SINCE THE NEW DESIGNATION AND MARKINGS TOOK EFFECT. ON OR ABOUT DEC/SUN/94 (AFTER SUNSET) A COMANCHE ON FINAL TO RWY 35R WAS GIVEN A GAR BECAUSE ANOTHER ACFT (CESSNA 172) HAD TAXIED ONTO THE RELOCATED THRESHOLD WITHOUT CLRNC. I BELIEVE THE FAA IS PURSUING THE LATTER OCCURRENCE AS A RWY INCURSION. IT SHOULD BE NOTED THAT AT NIGHT THIS RELOCATED THRESHOLD IS MARKED BY BLUE TXWY LIGHTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: TWR SUPVR STATED THE RELOCATED THRESHOLD WAS COORDINATED WITH ARPT'S OFFICE OF FAA AND THE PROPER HOLD LINES AND SIGNAGE ARE IN PLACE. SOME PLT CONFUSION EXISTS BECAUSE OF THE NEW THRESHOLD.