It requires a canister filling half the passenger compartment and lasts six seconds.
You are sat next to a 6000psi carbon fibre tub that under failure would turn you to mist, embed car parts in nearby pedestrians and ignite the battery.
You wouldn't believe. When I and my pack were teenagers, we could see the Steven Spielberg's "Duel" in the cinema (we could be, well, 13 at that time). After seeing the film, we started driving into one another on our bikes, yelling "I will drive you over!" How our bicycles survived that is beyond my current perception