I was driving West on hwy 169 near Nashwauk, on my way back from Grand Rapids. It was close to 3am I wasn’t alone, there was someone with me in the front passenger seat. It was a stretch of road near where a pipeline passes over the road. We were the only car on the road, when I saw lights appear in my rear view mirror. They were dimmer than car headlights and further apart horizontally. They approached closer, and we just kept checking the mirrors. It followed for maybe a minute. Then rose straight up and disappeared. It was dark, we saw no shape to what it was, only the lights.