Hot off the presses, here's the Vatican's newly released  discussion of the "moral aspects of driving." Here are it's Ten Commandments for drivers:
You shall not kill.
The road shall be for you a means of communion between people and not of mortal harm.
Courtesy, uprightness and prudence will help you deal with unforeseen events.
Be charitable and help your neighbour in need, especially victims of accidents.
Cars shall not be for you an expression of power and domination, and an occasion of sin.
Charitably convince the young and not so young not to drive when they are not in a fitting condition to do so.
Support the families of accident victims.
Bring guilty motorists and their victims together, at the appropriate time, so that they can undergo the liberating experience of forgiveness.
On the road, protect the more vulnerable party.
Feel responsible towards others.
My question for the discussion thread: On these principles, is driving an SUV a sin? (See, in this regard, Commandments I, II, V, IX, and X)