Triangular shaped object seen over rural road

While driving home with my mother on a rural road I saw a very low flying object cross our path traveling northwest.  The object had bright green, red and I think white lights and appeared to be triangular or boomerang shaped.  It appeared to be moving slower than a plane would be flying and it wasn't loud like a low flying plane or jet usually is. In fact I don't remember it making any noise at all.  It flew almost directly over our car and I lost site of it as it moved over trees on the other side of the road.  I asked my mother if she saw it and she said she did.  I then asked if it was a plane and she said she didn't know.  We continued home and did not really speak of the incident again.
Witness elects to remain totally anonymous; provides no contact information.  PD