You can hear the car(s) accelerate just prior to them coming in to view.
Note the cars ahead of them and the much slower rate of speed. This car was rippin' down the interstate.
Also note the car behind the crash vehicle- it too was traveling at a high rate of speed. Although the car is closely following at a high rate of speed, it does not get to the right to avoid the crashing vehicle and doesn't seem to de-escalate in an ordinary fashion.
Anons impression is that the car was remotely controlled, the driver reacts after realizing he's lost control and that is when he begins applying the brakes.