AFTER A CAT III APCH AND DURING ROLLOUT IN VERY LOW VISIBILITY; FOG AND ICE; FLC SAW A SAND TRUCK HEADING TOWARD THEM ON THE RWY. IT EXITED ON TXWY. TWR WAS NOTIFIED OF CONFLICT AND THEY SAID THE TRUCK WAS SUPPOSED TO BE ON THE PARALLEL RWY.

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DURING ROLLOUT FROM A CAT III AUTOPLT FLOWN ILS APCH IN CAT II CONDITIONS (100 FT CIG/1600 FT RVR); WE NARROWLY MISSED A SAND TRUCK WHICH WAS DRIVING TOWARD US ON THE RWY UPON WHICH WE WERE LNDG. VISIBILITY WAS POOR -- 1/8 MI IN FREEZING FOG AND ATIS INFO HAD ADVISED TO USE CAUTION DUE TO ICE AND 'SLIPPERY CONDITIONS' ON TXWYS AND RAMPS. NO BRAKING ACTION RPTS WERE GIVEN NOR ANY MENTION OF MEN AND EQUIP ON OR NEAR THE RWYS. AS WE WERE SLOWING THROUGH 80 KIAS; WE SAW LIGHTS COMING TOWARD US IN THE FOG ON THE ACTIVE RWY. JUST AS WE REACHED TXWY G; A LARGE SAND TRUCK TURNED OFF THE RWY ONTO TXWY G IN FRONT OF US AND WE REALIZED THE LIGHTS BELONGED TO THAT TRUCK. WE WERE 50-75 FT AWAY AS WE ROLLED BY TXWY G ON OUR WAY DOWN TO TXWY E. LUCKILY TXWY G WAS CLOSED TO ACFT OVER 105000 LBS; OR WE MIGHT HAVE BEEN HEADED FOR THE SAME TXWY THE TRUCK USED TO DODGE HITTING US. WE CALLED TWR AND ASKED IF THE GND RADAR WAS WORKING AND WERE TOLD THAT IT WAS. WE THEN ASKED IF TWR KNEW THAT THERE WAS A TRUCK ON THE ACTIVE RWY AND WERE TOLD THAT THE TWR NOTICED THE BLIP ON THE RADAR AND THAT IT WAS ONE OF THEIR SANDING TRUCKS -- AUTH TO BE ON RWY 6L; NOT RWY 6R.