About 2/3 the way up the 10,000 foot mountain, there was a relatively large very bright orange orb that seemed pretty close to the mountain. it was pretty dark and there were no other cars on the road so i slowed down as much as i could to watch it as long as possible. i couldn’t tell whether it was moving toward or away from me although it seemed like it was doing so at some points. it was moving rather erratically from left to right across tens of miles in seconds sort of like it was buzzing around like an insect, to reverse direction instantaneously while rising and lowering slightly the whole time. after about 10-15 seconds of this, the orb stopped and hovered for about 3 seconds, and almost as fast as you could blink it zoomed straight up and disappeared within a second.