As you would already know, car manufacturers keep trying to keep those pesky spy photographers from snapping shots of their latest creations to as to inject some sense of mystery as to what the new car will look like. Well Opel has revealed what they have done to camouflage the Insignia before it was released. It starts once the model is completed on the computer in 3D and the clay models are done. The designers actually create a 'facelift' of the new car to confuse the general public about the upcoming model's design, like adding a fake spoiler or adding a special adhesive foam onto the car's body to change the body contours of the car. Details of the lights for example are covered by black plastic.
Its also quite common for the developers of the cars to affix a fake badge onto the prototype to make everyone think its a new car from another manufacturer. And that black tape is positioned in a random and disorderly manner to create a flickering effect to blur the images on amateur photographers' cameras. And, the drivers themselves are part of the camouflage. They have been specially trained to avoid spy photographers, (or so they say) and one of their golden rules is never to stop in a public place unless its covered. I doubt that last tactic has proven much use since we're always getting images of prototypes at a petrol station..
These are just some of the official images of the Insignia prototype which weren't intended to be spy shots.
Source of images: MotorAuthority.com