Re: Driver in charge?
"People when sitting for hours doing nothing, as was this safety passenger (NOT a driver), become bored and disengaged from their surroundings. "
The US Government contracted Disney to produce a bunch of road safety and Driver Ed films in the 1950s and 1960s - they may be 50+ years old, but they show this problem has been around for at least as long as freeways have existed. (it used to be called highway hypnosis and distracted driving)
You can find them on Youtube without much difficulty