CLOSE PROX ON THE GND AT SLC. 2 ACFT CLRED ONTO THE SAME RWY FROM OPPOSITE SIDES IN THE FOG AT NIGHT.

Narrative

WE WERE FLYING AN LTT ON A CARGO FLT. I WAS THE PNF (CAPT). IT HAD BECOME VERY FOGGY AT SLC THAT EVENING. APPARENTLY RWY 34L WAS IN THE CLR. RWY 34R WAS IN THE FOG. THE VISIBILITY RPTED TO US WAS 3/8 MI AT TIME OF TKOF. IN MY OPINION IT WAS CONSIDERABLY LOWER. AS WE APCHED RWY 34R I CALLED THE TWR READY FOR TKOF. TWR CALLED US BACK AND CLRED US FOR TKOF. WE COMPLETED THE RWY ITEMS PORTION OF THE BEFORE TKOF CHKLIST AND TURNING ONTO 34R. JUST AS WE ATTEMPTED TO LINE UP WITH THE RWY I NOTICED A WHITE LIGHT PEERING OUT OF THE MIST. THE WHITE LIGHT WAS MOVING TOWARD US. MY COPLT (THE PF) TURNED THE ACFT L SO AS TO MISS THE OTHER ACFT. THE OTHER ACFT CAME INTO VIEW; A COMMUTER MDT. WE RPTED TO THE TWR THAT WE WERE UNABLE TO TKOF WITH AN MDT IN THE WAY. THE TWR DIRECTED US OFF THE RWY. WE EXITED THE RWY TO THE L (W) SIDE. THE CTLR APOLOGIZED AND TOLD US WE WOULD BE NEXT FOR TKOF. WE NEVER HEARD THE CTLR PUT THE LTT INTO POS AND HOLD. ONE IDEA IS THAT THE LTT WAS ON THE OTHER TWR FREQ. IN LOW VISIBILITY SITUATIONS I MAKE SURE EVERYTHING IS CORRECT BEFORE TAXIING FOR TKOF. I WAS NOT SPDING. TAKING THE RWY UNDER THESE CONDITIONS IT WOULD NOT HAVE BEEN PRUDENT TO GO FAST THROUGH THE CHKLIST AND TAXIING ONTO THE RWY. MY HEADS-UP COPLT KEPT US FROM POSSIBLY HITTING THE COMMUTER MDT. ONE LAST THING; THE AIRLINERS WERE LINED UP ON 32 FOR TKOF. I CAME UP FROM THE GA RAMP AND ENTERED THE RWY FROM THE E SIDE ON INTXN K1.