Two triangle shaped craft spotted over Elk Park, Montana.I was heading home on the highway from work on Tuesday 11/22/05 from my job 40 miles outside of town. This stretch of highway is about 10-15 miles north of Butte, MT. At approx. 2:20pm-2:30pm as I was climbing the winding pass up through Elk Park canyon I spotted 2 triangle shaped craft in the sky between 2 mountains. I was filled with a sensation of panic as soon as I spotted them because I knew what I was seeing was neither ordinary, nor something that I had seen before. Because I have no idea of the actual size of the craft, it is difficult to guage their altitude but they did appear to be flying higher than the mountains, and one craft appeared to be flying slightly higher than the other. The sun was bright that day and from the reflection of sunlight off of the craft they appeared to be chrome, they were very bright. At first glance the craft appeared to be stationary but after a few seconds of observation it looked like they were moving slowly towards the southwest. They also appeared to be moving much slower than any aircraft I have ever seen. It was a very cold day, yet the craft left no contrails as they moved. As I continued up the highway, my view of the craft was obscured as the road wound around a mountain side. I thought for sure I would have a clearer view of them another 1/2 mile or so up the road where the highway comes out of the canyon and opens up into plains, but when I got there they were gone. I thoroughly searched the sky for them and could not see them. They appeared to be moving southwest, and there were mountains a few miles south that I suppose they probably moved behind. There were other motorists on the highway that day but I'm not sure if anyone else saw them. Judging from their position in the sky I would guess the craft would also have been visible from another highway further south than the one I was on.(Homestake Pass, the highway from Butte MT to Whitehall MT) I did not observe any other aircraft in the sky at the time. I did not notify the police or any other authorities, but I felt that what I saw was so unusual that I should notify someone.By the way I am a ((deleted)) worker for the State of Montana, Department of ((deleted)).