It can't be deduced from the footage alone whether the Model S is braking or not, but it's clear that it decelerates and stops after it impacts the dummy car.

It can't be deduced from the footage alone whether the Model S is braking or not, but it's clear that it decelerates and stops after it impacts the dummy car. In the U.S. at least, it's highly unlikely that the driver in front would be found legally at fault in a similar accident. In most cases of rear-end collisions, the driver who impacts the rear of the car will be found at fault.