Unfortunately, as this YouTube video shows, the car just smacked straight into the back of a stationary truck, instead of automatically stopping in time like it was supposed to. The large crowd watching just made an already embarrassing situation worse.
Volvo claims the accident was caused by a fault with the car’s battery and, had a person been driving, they’d have realised something was wrong and done something about it. That might be the case, but then what’s the point of having the system in the first place?