ON LNDG FLARE AT FL37 ARPT; PAX OF AN R55 HELI ALERTS PLT TO IMPENDING CONTACT OF A VEHICLE DRIVER XING THE RWY.

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I WAS RETURNING TO TREASURE COAST AIRPARK IN MY ROBINSON -44 HELI. I MADE A NORMAL APCH TO RWY 9; AND NO TFC WAS NOTED VISUALLY OR BY RADIO. AFTER PASSING THE RWY THRESHOLD AT 400 FT; I CONTINUED WITH A NORMAL RATE OF DSCNT; WITH THE PROPOSED LNDG ZONE BEING MIDPOINT OF THE RWY. AT THE POINT OF LNDG FLARE; APPROX 20 FT OF ALT; MY L FRONT SEAT PAX YELLED 'LOOK OUT.' OUT OF THE CORNER OF MY EYE; I SAW AN ATV XING FROM L TO R; 90 DEGS TO MY PATH; AT A HIGH RATE OF SPD; COMING FROM THE N ON THE MAIN N/S TXWY. I TOOK EVASIVE ACTION TO AVOID A COLLISION; AND PERFORMED A QUICK STOP MANEUVER. THE DRIVER OF THE ATV LOOKED TO THE R; AND IMMEDIATELY STOPPED THE FORWARD MOVEMENT OF THE VEHICLE AT THE CTR OF THE RWY. THE ATV DRIVER APPEARED TO BE A YOUNG MALE. AS A RESULT OF MY QUICK STOP; THERE WAS NO IMPACT WITH THE VEHICLE. WITH MY FORWARD MOMENTUM STOPPED; I HOVERED WHILE THE ATC DRIVER MOVED FROM THE CTR OF THE RWY; AND EXITED THE RWY FROM THE DIRECTION IT CAME. I ROTATED THE HELI 90 DEGS TO THE L; SHONE MY LNDG LIGHT ON DRIVER AND MADE SURE HE WAS OK. HE APPEARED OK. AFTER HE CLRED THE RWY; I CONTINUED MY AERO-TAXI TO MY HANGAR.