This is so cleaver!
To promote the idea that this vehicle is essentially invisible to the environment, what they did was...this.
Agency: Jung von Matt/Elbe, Germany
Executive Creative Directors: Thimoteus Wagner, Fabian Frese, Götz Ulmer
Creative Directors: Micheal Ohanian, Jonas Keller, Martin Strutz
More info available from Mercedes Car Turns ‘Invisible’ In Guerrilla Campaign