AS I WAS TRAVELING THE HIGHWAY, MY ENGINE STARTING SMOKING. I WAS EXTREMELY FORTUNATE THAT I WAS COMING UP ON A SERVICE CENTER/GROCERY STORE IN IDAHO. THERE WAS INDICATION ON MY DASH INSTRUMENTS THAT MY TRUCK WAS OPERATING ABNORMALLY, OTHER THAN THE SMOKE SIFTING THROUGH THE HOOD. UPON MY PULLING OVER ONTO THE THE SIDE, I OPENED THE HOOD WITH USED OF HEAVY GLOVES AND A TOWEL AND CHECKED TO SEE IF RADIATOR HAD FLUID AS THE INDICATOR LIGHT HAD READ NORMAL. AS EXPECTED, COOLANT SPEWED OUT. I IMMEDIATELY CLOSED IT AND WAITED FOR IT TOBE TOWED INTO IDAHO FALLS TO BE CHECKED BY A SHOP THAT I WAS FAMILIAR WITH.