ON ROLLOUT AT JFK RWY 22L; AN EMB145 CREW SPOTS THE LIGHTS OF A VEHICLE ON THE RWY COMING TOWARDS THEM.

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WE WERE ON AN ILS TO RWY 22L AT JFK. VISIBILITY HAD BEEN RPTED AT 1800 FT RVR JUST ENOUGH TO FLY THE APCH. WE CHECKED IN WITH JFK TWR ABOUT 5-6 MILES OUT; AND THEY 1) TOLD US TO EXPECT A SLIGHT TAILWIND OF 5-7 KTS ON THE ILS; 2) TOLD US TOUCHDOWN RVR WAS 6000 FT. AND 3) CLRED US TO LAND. WE COULD SEE THE FIRST THIRD OF RWY APPROX 1 TO 2 MILES OUT ON THE ILS. I PROCEEDED TO LAND THE AIRPLANE. AS NORMAL; I APPLIED THE BRAKES AND THRUST REVERSERS. WE HAD SLOWED TO ABOUT 100 KIAS WHEN THE CAPT SAID; 'THERE IS A VEHICLE COMING AT US ON THE RWY.' ABOUT THE TIME HE SAID THIS; I COULD SEE THE HEADLIGHTS COMING AT US. WE WERE ABOUT HALFWAY DOWN RWY 22L WHEN WE SAW THE VEHICLES LIGHTS. WE CAME ALMOST TO A STOP AND THE CAPT TOOK CTL AND TURNED OFF ONTO TXWY JULIET. PRIOR TO TURNING ONTO JULIET; THE TRUCK AS IT WAS; HAD SEEN US AND TURNED TO THE R TO AVOID US. THERE REALLY WASN'T A CHANCE FOR US TO HIT THE TRUCK AS WE SAW IT SOON ENOUGH AND COULD HAVE USED EVASIVE TECHNIQUES. I WOULD ESTIMATE THAT THE TRUCK WAS ABOUT 2500 FT FROM US WHEN WE FIRST SAW IT; THEN APPROX 500 FT TO 1000 FT WHEN WE TURNED OFF. THE CAPT SAID HE HEARD THE TWR CLR THE TRUCK ONTO A RWY; BUT DIDN'T REALIZE FOR OUR RWY 22L. THE CAPT AND I ARE 100% SURE WE WERE CLRED TO LAND BY TWR. THE WEATHER HAD BEEN SUCH THAT THE WINDS WERE CHANGING OFTEN. THE APCHS IN USE AT JFK WERE BEING CHANGED BY APCH CTL BECAUSE OF THE SHIFTING WINDS AND DECREASING VISIBILITY. I DON'T REMEMBER ANYONE BEHIND US ON THE ILS TO RWY 22L. IT IS MY OPINION THAT THE TWR CTLR 'FORGOT' WE WERE LNDG ON RWY 22L; AND CLRED THE TRUCK ONTO THE RWY AT THE SAME TIME WE WERE LNDG. HAD THE VISIBILITY STILL BEEN 1800 FT RVR LIKE IT HAD BEEN RPTED 10 MINUTES PRIOR; WE MIGHT NOT HAVE BEEN ABLE TO SEE THE TRUCK UNTIL IT WAS TOO LATE. THANKFULLY THE VISIBILITY HAD INCREASED TO 6000 FT RVR AND WE WERE ABLE TO SEE IT AND AVOID IT. SUPPLEMENTAL INFO FROM ACN 622015: ON THE ILS RWY 22L AT JFK; I CHECKED IN WITH TWR ABOUT 5 MILES FROM THE RWY. BOTH THE FO AND I RECALL HEARING THE CTLR STATE; 'CLRED TO LAND;' WITH A RPT OF THE RVR BEING 6000 FT AND A QUARTERING TAILWIND RPT. THE CEILING WAS AROUND 1000 FT AND WE HAD SEEN THE RWY ABOUT 2 MILES OUT. DURING THE LNDG ROLLOUT; I HEARD THE TWR CTLR TELL A VEHICLE THAT HE IS CLRED ONTO RWY 22L. AS WE WERE APCHING HIGH SPEED TURN OFF TXWY JULIET; I SAW THE VEHICLE PROCEEDING NORTHEAST TOWARDS US. AT THIS POINT WE WERE AROUND 60-70 KTS AND I TOOK OVER CTL OF THE ACFT FROM THE FO. WE EASILY MADE THE TURN ONTO TXWY JULIET. AS WE WERE CLEARING; I TOLD THE CTLR THAT THERE IS A VEHICLE ON THE RWY. THE CTLR TOLD THE VEHICLE TO TURN R; OFF RWY 22L. THERE WAS NO IMMEDIATE THREAT OF PROXIMITY. AT THE CLOSEST POINT BEFORE WE TURNED OFF; I ESTIMATE THE VEHICLE WAS ABOUT 1000 FT AWAY. RIGHT AFTER THE CTLR CLRED THE VEHICLE ONTO THE RWY; HE TOLD AN ACR Y FLT THAT WAS LNDG BEHIND US THAT A VEHICLE WAS TAKING THE RWY AND WOULD BE CLRED BEFORE HIS ARR. AT THE TIME OF THE APCH AND LNDG; TSTMS WERE IN THE AREA AND ATC WAS CHANGING AROUND RWY CONFIGURATIONS. THE 'ATMOSPHERE' WITH ATC WAS SLIGHTLY CHAOTIC DUE TO THE RWY CHANGES AND WEATHER.