Google is your friend. You have the name of the scientist. Go check out the papers and read 'em!
As for your claim, "In real life, the majority of people WILL stop talking if they need to concentrate for a busy intersection / dangerous road and if there's an "OH SHIT!" situation, they won't keep holding the phone".... You've missed the point entirely. If you enter an "oh shit" situation while on the phone, you will NOTICE THIS MORE SLOWLY. That is what the research says: your reactions are delayed due to distraction. And then it's too late to drop your phone.