What is the stopping distance for a car travelling at 80 mph?

yes its 622 feet, but the state of the driver does not affect the stopping distance of a car. this is only affected by the mass of the car and the state the brake pads are in. so you can be drunk or sobre but the stopping distance will always be the same, its the thinking distance that is affected by the state of mind the driver is in.

The stopping distance of a car most certainly IS affected by the state of the driver in question, due to braking systems not being specifically on or off, rather being sensitive to the pressure applied to them. If the driver in question brakes too hard, or too softly, then the stopping distance will change, obviously.