FLC OF BA3100 ON ROLLOUT AFTER LNDG IS UNABLE TO COMPLETE TURN TO TXWY ONTO A REVERSE HIGH SPD EXIT. TWR ASKS IF THEY WOULD LIKE A R TURN OR A 180 DEG. EXECUTING THE 180 DEG THEY TAXI ONTO GATE. THE YELLOW LINES ARE NOT VERY VISIBLE. THEY NEVER EXITED THE RWY; JUST LOOKED AT THE GRASS.

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UPON TAKING CTL OF ACFT FROM FO; BEGAN TO TAXI DOWN RWY. STARTED TO TURN OFF ONTO TXWY G DIRECT HIGH SPD TURN OFF FROM OPPOSITE RWY. STARTED TO TURN ON YELLOW LINE AND CONTINUED TURN. STOPPED TURN WHEN REALIZED NOSE OF ACFT WAS NOW PAST ENTRY TO TXWY G. RECEIVED CLRNC TO MAKE A 360 AND EXITED RWY TO THE GATE. PARTS OF YELLOW LINE ARE OBSCURED; HARD TO SEE AND OUR TAXI LIGHT WAS ON AND WORKING. ACFT STAYED ON RWY THE WHOLE TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE WAS FLYING A BA3100. THEY WERE LNDG ON RWY 10R. HE FOLLOWED THE YELLOW LINE BUT ENDED UP FACING THE GRASS AND WITHOUT ENOUGH ROOM TO COMPLETE THE TURN. THE TWR ASKED IF THEY WOULD LIKE R TURN OR A 180 DEG? THEY INDICATED A 180 DEG WAS PREFERABLE. THERE WAS FAA PERSONNEL ON BOARD THE ACFT AND THE INCIDENT WAS DISCUSSED WITH HIM. HE INDICATED NO PROB. THEY HANDLED IT WELL. RPTR DISCUSSED THE INCIDENT WITH CHIEF PLT AND GOT THE SAME RESPONSE. RPTR WAS QUICK TO STATE THAT THEY WERE NEVER OFF THE RWY; JUST LOST SIGHT OF THE YELLOW LINE. LAST WK RPTR NOTICED THE INTXN AT TXWY G WAS BLOCKED OFF AND IT APPEARED THEY HAD SOME HVY EQUIP AT THE LOCATION AND WERE DOING SOME CLEAN-UP OR REPAVING.