Large hovering craft, silently floated away when I stopped my car, at night with lights

I was driving and saw bright lights that appeared to hover over the side of the freeway. I was on the phone with my dad and hung up because I wanted to film it. It seemed like a low plane at first but quickly I realized I was approaching it, and it wasn’t moving. It was crazy. When I passed it going 40 mph in a 70 I saw the side of it. It was not flat like a drone but more ball shaped? Maybe rectangle? But not flat. It had volume. And it was very large? Truck sized at least. And silent. I pulled over and started filming again and it just started moving away from me opposite direction, along highway. I tried to zoom in on it but it’s very hard to tell in video. It seemed to have two big circles on the back of it, inside where the light was coming from. And that’s the direction it moved. Like big jet engines on the back is what it made me think of. But they weren’t lit up and it was silent.