Witnessed low flying craft on the pa side of white clay creek while driving towards 896 on hopkins rd. object was moving slowly above the trees and the whole underside was a bright light but also reflective at the same time, like glass or mirrors. the object was larger than a helicopter. we couldn't hear any sound from it inside our car. it was while driving past the open fields but we lost sight of it when we moved to a denser tree section of the road. we didn't see any evidence of it once we pulled out to 896 a minute later. it vanished.