A DH8 CREW MADE A GAR WHEN A VEHICLE WAS DISCOVERED ON THE RWY.

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UPON CONTACT WITH THE TWR CTLR; WHILE FLYING THE ILS RWY 28 TO SYR; WE WERE INFORMED THAT THERE WERE MEN AND EQUIP ON THE RWY (RWY 28) AND A LNDG CLRNC WAS NOT GIVEN. A FEW MINS LATER; LNDG CLRNC WAS GIVEN. APPROX 500 FT AGL; WE BECAME VISUAL AS WE DEPARTED THE PASSING SNOW SHOWER. WE WERE ABLE TO VISUALLY CONFIRM THAT THE RWY OF LNDG WAS CLR OF SNOW REMOVAL EQUIP. WE ALSO NOTICED EQUIP REMOVING SNOW ON THE XING RWY 15/33. I MENTIONED TO THE CAPT THAT A SNOW PLOW WAS MOVING RAPIDLY ON RWY 33; FROM OUR L TOWARD OUR LNDG RWY (RWY 28). AS WE DSNDED; WE REPLIED THAT IF WE HAD TO GO AROUND WHAT THE PROC WOULD BE. WITH OUR PLAN IN PLACE; AS WE REACHED 200 FT AGL; THE PLOW PROCEEDED TO CROSS ONTO OUR RWY. UPON ENTERING OUR RWY; HE MADE A TURN THAT LOOKED AS IF HE REALIZED HIS MISTAKE; BUT TURNED OUT TO BE HIM SETTING UP FOR HIS U-TURN TO GO BACK ONTO RWY 33. AS WE REACHED 100 FT AGL; THE CAPT LEVELED OFF AND STARTED ADDING PWR AS WE WATCHED TO SEE WHAT THE PLOW WOULD DO. AFTER HIS INITIAL TURN TO THE L; HE TURNED BACK R; PROCEEDING ACROSS OUR RWY CTRLINE IN HIS U-TURN. AT THIS POINT WE WERE ADDING PWR AND PERFORMING THE GAR. WE RPTED TO TWR 'GOING AROUND; SNOW PLOW ON RWY.' WE MADE A VISUAL PATTERN BACK AROUND AND LANDED WITHOUT FURTHER INCIDENT. TWR ASKED EQUIP PEOPLE IF THEY HAD BEEN ON THE RWY. WE DID NOT HEAR THE REPLY. IT PAYS TO KEEP YOUR EYES OPEN; SITUATIONAL AWARENESS UP; AND BE READY WITH A PLAN IF THINGS GO AWRY!