I was driving with my dad to go pick up my sister and we were on a road that's not extremely busy. We came around a corner and slowly moving right above the trees and across the road we were on was a huge triangle-like craft. It was dark out but we could see that the corners or the triangle were rounded and we were then almost right underneath it. We were able to see that underneath it were bigger sized lights that were flashing quickly in the sequence of 2,1,2,1... We rolled down the windows and there wasn't a single sound. It was going maybe 2-3 miles an hour. My dad tried to get out of the car and I screamed and grabbed him because I was young and terrified that he was going to get abducted. We watched as it glided almost over us and continued over the gully, we tried to follow it but were unable to do so as there were no roads in the direction the craft was going. We were pretty sure that it was an alien craft but thought it could have possibly been some sort of government aircraft the army base about 15 miles away had been testing out. We were in complete awe, I was terrified at first but then just curious. This happened about 20 years ago and it's still one of the clearest memories I have in my life.