big blue round object with cylinders all over and blue torch flames coming from cylinders. all blue, sky blue. no sound emitted, none. it was bright pretty blue it come between mountain ridges by highway on my right side, i slowed down as did other veichles that 3;30 a.m. morning. clear night. blue object was slow above the trees and didn't burn the trees. about a 1/4 mile away if that from highway. it turned to it's left and was about 2 to 3 truck and trailers wide at the middle across. this happened spring of 2012 in the smoky mountains area by the national lab, i remember, around there. it stayed below the mountain ridges in the valley and continuied through the valley. was stunned at first then awe struck then felt very concerned about life. i think its usa building a bigger vechile and that was just the engine part of it, like the ones you see with a ball or round object in the middle. i traveled alot for 25 years plus truck driving at night.