A bright light was observed, not moving @ about 60 degrees above horizon. Without moving, it disappeared. It was observed for approx 1 min. the length of time I travelled from milepost 264 to 265 @ 62 mph.The light was a bright white-lemon yellow color. It appeared larger than The planet Venus when I have seen Venus as the evening star. It appeared to be about the size of one of those red lights atop a cell-phone booster tower, but much, much further away--higer in the sky. I would guess it was approx. 60 to 75 degrees above the horizon. It did not move, it instantly vanished. I work as an RN in a maximum security prison, I travel I-5 between Salem and Portland 5 nights a week.