We saw a saucer-shaped vehicle at night in Indiana in the winter of 1975.

At first, it was just a light in the distance that moved erratically. Sometimes it would stay in one spot, sometimes it would move quickly, more quickly than a helicopter or an airplane. Sometimes lights would flicker. We had to stop at a gas station to fill-up and we didn't even talk about this vehicle that we were following.
When we got back on the road, my cousin's wife was driving. She spotted it and it was closer because it was brighter. This time it crossed over to the passenger side of the highway and stayed in one spot. When we approached it, I rolled down the window. My cousin and I stuck our heads out the window and we saw it about a stone's throw off the highway, about the height of a water tower. There were windows around it, with what appeared to be lights on top, although they weren't lit. Right after we passed it, it took off with no sound and at an extremely high rate of speed.
Witness indicates that the date of the incident is approximate.  PD