Driving on Holly Springs Rd, my wife & I saw an object flying just above the treetops. Object was circular, approximately 30 ft in circumference. It had 5 lights that were equally distant & all lights were toward the outside of the object (I am describing the underside of the object). It was tilted slightly in the direction that it was moving. Speed was probably 20 mph when we viewed it. We turned on Cary Parkway to try to follow it, but could not see the object any longer due to the quantity of trees. We unfortunately did not get any video. More people had to see it, because traffic was very heavy.