https://abcnews.go.com/Health/Healthday/story?id=4507310&page=1
A popular report. There is a whole body of scientific evidence here.
""Drivers with passengers were almost 60 percent more likely to have a motor vehicle crash resulting in hospital attendance, irrespective of their age group. The likelihood of a crash was more than doubled in the presence of two or more passengers," "
That is a standard result.
Biting the hand that feeds IT
