Here is more interesting stuff about something that is the most likely causation factor of violence these days
Individual differences and the car as an annex of the home
Individual differences in our predisposition to be aggressive may be important in the driving experience in deciding the outcome of conflict.
The extent to which the vehicle symbolizes real and imagined aspects of the driver's individuality has already been outlined; the car is an indication, to both the driver himself and those around him, of social standing, of wealth, of attitude, and of personality.
But when a situation of conflict arises,
individual differences may again be of singular importance.
Any form of attack is a reliable and potent stimulus for aggression, particularly when the "victim perceives the event to be wholly deliberate and indicative of malicious intent.
If this is not the case, i.e., if the individual decides on balance that the conflict arose from error and misjudgment, as is frequently the case on the road, the extent to which aggression is used in retaliation is probably determine to a greater extent by individual predispositions.
The problem of feedback in the driving environment is again important; if it is relatively difficult to communicate to another driver that an unfortunate maneuver was the result of a mistake on your part, his decision as to whether or not your action was deliberate and personally aggressive is internally generated --
you are uniquely reliant on the margin with which he gives the benefit of the doubt, the extent to which he feels generally aggrieved, and therefore his predisposition to being aggressive."