That could be one (or both, I guess) of two things:
- Bright reflections from the white car into the lense, making the scene a whole lot brighter. (Think of it as looking at a car and having to squint because the sun reflects off of it very brightly.)
- Your camera automatically adjusting the brightness of the picture because a light object came into it. (The camera is trying to adjust for the extra brightness.)
Now I've tried looking at it a bit more closely. Here's two (almost) consecutive frames:
This would suggest that it's an issue with your camera's settings: the brightness goes down after the car is out of the shot. Make sure settings like exposure and gain (or just brightness) are fully manual. There also might be something going on with the white balance: in the first frame, the floor seems to be more yellow or orange than later. Make sure the white balance is on manual too.