Pyramid UFO seen over Bucks County PA

My brother and I were driving home from dinner and it had just gotten dark. We went over a bridge and the road began to go uphill. to my right, I noticed a HUGE bright object very low to the treeline. I thought it was a low plane at first but then it got closer and we saw the shape- a flying pyramid. It was AT MAXIMUM about 100 feet above the trees. it had to have been moving about 100 mph too because we tried to keep up with it but it was gone so fast and the speed limit on the road was 45. The object was DEAD silent too. It was as black as the night sky but each corner of the craft gave off a strong blue/white light. In total I'd say the craft was about as big as your average family house (about 60 feet long). After the craft flew over the road, we watched it fade into the night sky as it sped away, dead silent.