Black Triangle Sighting in Annapolis, Maryland on September 18th 2015 – white triangle shape over highway. changed shape then disappeared

On Friday, September 18th, my mother and I were driving from New Jersey to Maryland. It was early morning (somewhere between 8a-9a) and I was driving, my mother was in the passenger seat. We were on I95 when I looked up at a large grouping of clouds passing overhead. The clouds themselves weren't unusual but an object within the clouds caught my eye. It was a perfect white triangle, completely solid, and I thought it was strange because the clouds it was surrounded by were thin and wispy (I could see the blue sky thru the clouds). I pointed it out to my mother and she thought it was odd as well. We continued to watch the object. The clouds eventually rolled away and all that was left was blue sky and the white triangle. My mother and I continued to watch the triangle as it hovered over the highway. After a few minutes it began changing shape. It was no longer triangle shaped. The wings seemed to spread apart and the object had a longer, cylindrical shape. The shape continued to change like a transformer trying to figure out where all its pieces belong. My mother attempted to take pictures of the object but had a hard time capturing it. The photos that she did take look a white streak in the sky. After 20-30 minutes the object disappeared. Later (maybe 10 minutes), a large helicopter flew overhead, coming from the direction where the object had been. We did not see it again.