Have you ever seen a Ghost Billboard? in a beautiful and innovative way, Audi places a Disappearing Billboard in the street to highlight the features of its A7 H-Tron Sportback quattro.
The Audi A7 Sportback h-tron uses a fuel cell coupled with a hybrid battery and additional electric motor in the rear. Notably, nothing but water vapor comes out of the exhaust. And so, Audi created billboards that similarly leave nothing behind.
This Audi Emits Nothing but Water Vapor, So Its Billboards Are Made of That Too