Disc (metallic saucer-type) object, with windows, a bright red band along the bottom, lifted and flew away

I was driving from Portland OR to Lewiston ID. Around 9:40pm, outside Dayton WA, heading east on Highway 12, near milepost 372, I came around the corner (crest) and saw an object about 200-225 ft off the left side of the road, slightly below me, lifting up. I stopped, rolled down my window and heard a very light sound similar to a Lear jet, as it lifted and flew away. I watched for about 25 seconds and saw only red and white lights as it disappeared southwest.
During this time, I was able to see it lift on my left side, rising to fly away.
It was night with the moon illuminating the object. It appeared dark metallic, about 35-40 feet in length with windows. Maybe 8-10 feet in height. I could not see inside. It had one light at each end which stayed constant. A bright red band of light circled the bottom of the craft, keeping a constant color.