In theory, the foam would "instantly disable" the oncoming vehicle by clogging up the engine intakes and blocking the steering mechanism. The foam would absorb the vehicle’s kinetic energy, bringing it to a stop. "Lastly," the company says, it "will leave the driver trapped inside an encapsulated vehicle, with no means of orientation." The system could be tripped automatically (through pressure sensors or light barriers) or by remote control. It’s one of a bunch of new technologies being floated for stopping a runaway (or suicide) truck.This is a pretty cool weapon concept either way. I'm imagining soldiers firing these goo-canons at vehicles and enemy troops....the very thought would make Spider-Man proud.