A320 ENCOUNTERS A SWEEPER VEHICLE ON THE TXWY AFTER LNDG. CAPTAIN IS DISTRESSED WHEN THE SWEEPER DRIVES UNDER THE ACFT'S WING TO ELIMINATE THE CONFLICT.

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UPON EXITING THE RWY WE WERE GIVEN INSTRUCTIONS TO TAXI DOWN TXWY F AND HOLD SHORT OF RWY 25R AT F6. WE EXITED THE RWY ON G3 AND WHEN MAKING THE R TURN TO TAXI E ON TXWY F; WE WERE HEADED FOR A STREET SWEEPER ON TXWY F. THE VEHICLE DIDN'T SEEM TO SEE US AT FIRST. I TURNED ON ALL TAXI AND RWY LIGHTS TO GET HIS ATTN. WE STOPPED THE PLANE AND INQUIRED TO THE TWR AS TO THE VEHICLE. THEY CALLED THE VEHICLE AND TOLD THEM TO GIVE WAY. THE DRIVER SAID THAT HE COULDN'T MOVE OFF THE SIDE OF THE TXWY AND GO INTO THE DIRT. HE HAD MOVED OFF THE TXWY; BUT WAS STILL ON THE SIDE OF THE TXWY. WE WERE ON THE R SIDE OF THE YELLOW CTRLINE OF THE TXWY; AND IT APPEARED THAT WE WOULD STILL HAVE TO TAXI OVER HIM TO GO BY. WE STAYED WHERE WE WERE AND WAITED FOR HIM TO TURN AROUND AND LEAVE. HE THEN PROCEEDED TO TELL THE TWR THAT HE'D JUST DRIVE BY. HE DROVE UNDER THE L WINGTIP AS HE DROVE W ON THE SHOULDER OF TXWY F. THE TWR CTLR WAS OPERATING THE GND; TWR AND CLRNC; AND DIDN'T SEEM TO KNOW WHERE HIS VEHICLES WERE; AND GETTING A WORD IN EDGEWISE ON THE FREQ WAS VERY DIFFICULT. THE DRIVER'S ACTIONS IN DRIVING HIS TALL VEHICLE UNDER MY WINGTIP AT NIGHT ON A TXWY SHOULDER WAS UNACCEPTABLE AND I TOLD TWR SO. WE CONTINUED TO THE GATE AFTER HE LEFT. ONCE OFF THE ACFT A CITY OF ZZZ EMPLOYEE CAME TO ASK US QUESTIONS ABOUT THE INCIDENT. HE INFORMED US THAT THE DRIVER WOULD NOT BE DRIVING ON TXWYS UNTIL THE INVESTIGATION WAS COMPLETE.