That&#x27;s already been release since the previous version via the traffic aware cruise control and emergency braking.<p>Specifically, the Model S locks onto the car in front of you and matches its speed, maintaining a certain number of car lengths behind it (which you can set).  When the car changes lanes, your Model S speeds up a bit to fill the gap, and when a car cuts into the lane, the Model S slows down (although this one is a bit scary).  If the car in front comes to a complete stop, the Model S also smoothly slows down into a complete stop.