Triangle of lights moving above highway

I was driving northbound on route 1, north of Dover Delaware around 9:00 pm. The particular area is pretty dark. It was very cold at the time. The sky appeared mostly clear. I saw 3 lights in the sky in a triangular formation. The formation was moving slowly across the highway from left to right. Definitely slower than airplanes move in the area. The formation was from my perspective: the light farthest away was leading, the second nearest light was behind the leading light, to the left of it closest to me, the 3rd light was appeared not quite as far away as the leading light and was at the rear (left)of the formation in the direction they were going. The time I saw the formation was probably less than 10 seconds so I don’t believe it could have been extremely high. My guess of the distance from light to light is hundreds of feet given its width in comparison to the highway. The lights were an off white similar to an incandescent bulb hooked to a low battery. All 3 lights appeared spherical. All 3 lights were flickering very fast. Dozens of flickers a second. All 3 lights looked kind of like they were out of sharp focus and made them appear larger. Meaning the center of the light was brighter and the outer edges were dimmer. Additionally the lights were not bright such as one would see on an airplane. You can see many airplanes in that area because Dover AFB is south of Dover. I lost sight of the lights as I drove under them.