Here's an article which takes an interesting take on vehicular accidents in combat zones. There is no question about the effect of stress or PTSD, avoiding dangerous situations, the effect of drinking or drugs, or the possibility of staged accidents.
Even the comment on the article seems to be loaded with revisionist thinking about the history of the war in Iraq.
The fact is that there have been a statistically large number of vehicle accidents which have caused non-combat deaths. There must be a rational explanation.
In my humble opinion, this article does not honestly address the problem.