My wife and I was returning home from Bangor and was crossing the Allamoosic bridge on rt 46, Bucksport when off to the right of us,we saw about a mile away, this large slice of pie shaped object coming at us hugging the treetops. I slowed down as we watched it approach, cross and disappear over the treetops, to our left. It was very close, it had a white light that switched to orange on its underbelly. The light wasn't a single dot or beam but was more like a luminous panel. It was grey/charcoal in color. It was not aerodynamic by any means. It did not make a sound, it did not seem to bother the trees it was "floating" over, I say floating for it was moving very very slow...maybe 15-20 mph. I could only see a side and its underbelly and then as it passed by, the back and underbelly. The side and back had an "industrial" appearance to them. The bottom or underbelly was smooth and covered those illuminated "panels". This "craft" was observed by two people in full daylight on a very clear day. It was very close.