UFO Close Enough To Throw Rock At It, Makes No Noise In Bethlehem PA 1994

We were cruising around in our car at night, I was the passenger and my friend was driving.  This was just my friend and me in the car.  Anyway we were driving on top of South Mountain near Stabler Arena when I noticed what look like a helicopter above a new housing development.  They were still building this development.  This was about 7 football fields away or so.  I said to my friend as a joke "look its a UFO"!  We thought it was a Helicopter because it was just staying still and hovering.  I said to my friend to flash your lights at it in which he did.  This object began to move upon us flashing our lights coming directly towards us.  We then began to drive towards it as well.  It amazed both of us that it responded to our flashing.  There were no other cars in the area either.  Anyway we drove closer to it arriving at the main road and we stopped our car in the middle of the road.  This object was still coming right at us and moving very slow.  I got out of the car and my friend stayed in until curiosity finally got him out of the car as well.  I said to my friend "what is that"? We both at this time were filled of adrenalin as this object slowly passed right next to us. It was close enough to throw a rock and hit it.  We could both see it wasn't a Helicopter or a Airplane.  I can remember it was Triangle shaped with 3 lights.  One in the front and 2 in the back.  You could see metallic on it as it went by, we looked at the side of the ship and some under belly.  We were both stunned at what we were seeing, the thing that always got us was that there was no sound, maybe just a slight hum.  You couldn't hear an engine!  It slowly went passed us.  It disappeared when it went behind the other side of the mountain.  I'm still shocked at this.  We both got back into the car and drove off.  My mind still tries to figure out what really was that thing.....My friend and I talked about this recently bringing back a lot of memories etc and we wanted to report this to you.  We both pledge that this is 100% true, we were not drinking and in a normal solid state of mind.
 2 In PA
Witness indicates that the date of the event is approximate.  PD