UFO Sighting in Calgary, Alberta on April 30th 1969 – followed car and then we drove right underneath it could see it from front windshield

we were driving east on the highway just outside of Calgary I don't remember the exact time but as we were driving I noticed something over the highway really low maybe 20 ft up. It was travelling the same spead as our car then it started to slow and I said it is slowing down for us. I was really curious as to what it was and so it slowed down then stopped and we drove right underneath it. I looked up through the windshield and could see this thing from underneath. it was really huge , the size of a football field and I could make out the underside of this thing. There were no windows or anything like that. This was in 1969 so a very long time ago. I wanted to get a better look at it and asked my husband to pull over so I could get out and have a better look so we did. I opened the car and got out and it took off at lightning speed sw at. I could see it off in the distance just sitting there. We looked for a few min and then got into our car and headed back down the road. There was a big rightup in the Calgary Herald a week later saying that there were 8 sightings that same day. I have never seen one since like that and probably never will but they are real. That's pretty much it.