I have news for you. That study is full of ****. All you have to do is ride "with a few different people" --if you have the guts-- and watch THEM drive and talk on the phone.
I'm referring here of people who might be doing MORE than flirting with their girlfriend or blabbing with their friends. I'm speaking of people doing stuff like trying to run a business on the run while driving.
I speak here from experience. I used to have a couple of bosses who were involved with important business decisions while trying to drive. It was NOT pretty, nor was it very comforting to try and "suggest" that they HTFU and drive.
