Oval object appears for 10 seconds Montreal

As I was driving my car on the highway what appeared approximately quarter mile away outside passenger window , was at first what I thought to be A shooting star or comet or rock burning up as it had a vapor trail.it was heading towards the highway I was driving on. so I visually followed it until it was right overhead as it was crossing the highway which I saw it threw my sun roof and then it vanished.as did the vapor trail.
The oval object was the size of two buses side by side ,white at the exterior of object then a pinky rose color, more white then green in the center of the object, it was like it was traveling with a cloud around it (haze) the object was translucent I could see through it,
At first I thought the object was moving downward from the sky ,then I realized as it approached closer it was actually heading upward as it passed over my car ,no more then 250 yards above, I had a clear view into it ,it was as if it was in what I suppose stealth mode would be. I was waiting to see it out of my drivers window as it was passing but it just made a noise like a vacuum cleaner and vanished before .
It all happened so very fast 10 seconds or so and I driving at the time so I had a lot to focus on including road ahead of me ,wish I had a camera on the front of my car .