Länk - Så stoppar man en lastbil
The foam stops the vehicle, absorbing the impact like a giant marshmallow. It also blocks all the engine intakes and jams the wheels in place, preventing it from being driven away. Finally, "it will leave the driver trapped inside an encapsulated vehicle, with no means of orientation." Presumably, it is a non-lethal system so long as someone rescues the driver before he suffocates.
Läs mer: Stopping Trucks The Superhero Way (Updated) | Danger Room from Wired.com