These days, thanks to ABS / DSC and other safety net electronics, luckily the classic ‘PANIC’ reaction when the car “unexpectedly” starts skidding of braking is actually not a bad one!
(ive put unexpectedly in quotes because ime, it’s most often not the least bit unexpected, it’s just the driver hasn’t spotted the blatantly obvious warning signs.)
I’d also say that an a skid pan test is practically useless, as the average driver will have not intrinsically (ie muscle memory,not conscious thought) learn’t the necessary response, esp. in a panic situation. IME, doing high speed driver training, something that does work is putting the driver into a car that can be caused to suddenly spin (we used a modified ABS system to lock a front wheel and pitch the car into a spin), getting them to cruise up to 70 mph on a wide ex airforce base runway, and then without warning spinning the car!
Call it shock tactics, but it tends to be a lesson that is remembered, as the average driver really doesn’t like going backwards at 70mph, especially when you after you’ve stopped you get out, look at the skid marks, generally covering pretty much all the width of the runway, and say “fancy that happening on the M1 in rush hour??