[ajmurmann]

I think you are definitely on to something here. For the alcohol and speeding I wonder how many of the fatalities are people other than the person speeding or drunk. I am not even thinking about passengers, but people in other cars, bicyclists or pedestrians.

[melling]

Nobel Prize winner John Nash, and his wife, both died as backseat passengers when their driver lost control, hit the guardrail, and they were thrown from the car on the way home from the airport.

https://en.wikipedia.org/wiki/John_Forbes_Nash_Jr.#Death

Needless to say we should wear seatbelts even in the backseat of an automobile.