alledged UFO sighting unreported from over 20 years ago, if story is true it could not be a man made aircraft nor a natural phenomenon

My mother and her cousin (my second aunt) during the summer of 1987 insist that they saw a a trapazoid shaped object above them while driving in an automobile heading southbound on Stelton rd. AKA county rd.[529] on there way to TOP's appliances which is at the corner of [529] and NJ state HWY 27. Now I know this has taken an incredibly long time to reported by I can remember there accounts of this very vividly. And no, this report is not intended as a joke or hoax.
They say simply that they saw trapezoid shaped object with clearly distinct multicolored lights momentarily turning on and off while the object was comming from starboard (meaning from their right side facing front) and going in a generaly port direction (to their left) while making sharp right angle turns and "whipping in different directions" that's exactly the way they described it's movement ... They estimated it's size to be comparable to a typical 737 type passenger jet airliner and it was at a consistantly continuous altitude of several thousand feet above the ground (close to the same height as a airliner usually is in that area). They both insist that it could not be a reflection because they actually pulled to the right hand shoulder of the road and watched the thing go by. They say that no other vehicles were passing by in either direction when they were stopped. Unfortunately in addition to having no other witnesses to their account they do not have any phy! sical evidence of it either (photo's or anything else). There location where they pulled over was just in between the camp Kilmer U.S. Army reserve center and a small strip mall. All those years ago that part of Stelton road was not as developed as it is today.
My mothers occupation is a homemaker and my aunt works as a real estate agent along with doing sales for a book publisher.
Witness indicates that date of the sighting is approximate.  PD