Big as a house & made no sound

It occured in far north Durham county, after leaving some friends @ a closed down old race track late @ night. They made a left & I made a right, after traveling only a short distance, maybe 3-5 miles I noticed the object to my north moving very slowly & horizontaly. To my right was a large pasture surounded by tall pine trees, the road was a small 2 lane black top. It moved from the north traveling south where it passed over the road approx. 1/8 of a mile ahead of me. It was pitch black & no around but me, it was so bright my head lights were washed out & lit up my entire car & about the size of a split level home. There was absolutely no sound, I watched it move off to the south & out of sight. For a few mintues I sat in my car wondering what I had just seen, but to this day I have no idea. I work in the aviation field & I've never encountered an aircraft that is completely silent.
Date may be approximate.  PD