Huge totally silent triangular object glides overhead as we drive in our car for more than 2 miles. Very close range. Red lights and yellow lights.

We were travelling on our usual route home from a practice at 9:30 pm. As we approached the Shell gas station on Rt. 22 in Bedford I noticed a row of red lights above the station. Hmm, I never noticed a bunch of wires or something with lights there before, I thought to myself. Suddenly I noticed the lights were moving. (The sky was very dark, so at this point all I saw were the lights.) "What the hell is that?!" I blurted out to my child.  We turned the corner at the Shell station onto route 172 and I opened my window and kept driving and asked my daughter to keep watching it as it was now still on the drivers side but sort of traveling with my car.  I dont recall any other cars around us.  I opened my window to try to see it better and hear it.  The next thing I said was, "The thing is HUGE!" It was more of a feeling because I couldnt see it clearly. (It must have been black.) The shape was more implied than seen--triangular or possibly boomerang shaped, but very straight lines. There was absolutely no sound at all. I couldn't believe something could fly and be that quiet.  I kept thinking of some kind of "glider."  Anyway, we drove along and it passed overhead and now it was on my right hand side. I finally stopped the car because it kept going to the north and I wanted to get a look at it, but it disappeared (downwards) behind the tree or brushline just before the highway (Rt.684).  When I first saw it I thought about the fact  that the Westchester Co. airport was only about ten miles away in the direction it was coming from, but I've never seen anything like that from an airport.  My daughter and I went home and drew pictures of it (separately) to show our family. I never reported it to anyone, but I have recently heard a couple people describe the exact same thing......We were not frightened, just interested, and when the thing was going out of our sight we could see yellow lights as well as red.  I remember back 15 yrs or so there was some kind of ufo sightings or hoax or something regarding the ai! rport at Stormville. I am not a UFO buff. This is the only one I have ever seen in my half-century of life. Sorry this is so old. Do you know what this could have been?