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Falstaff: "To die is to be a counterfeit, for he is but the counterfeit of a man who hath not the life of a man; but to counterfeit dying, when a man thereby liveth, is to be no counterfeit, but the true and perfect image of life indeed. The better part of valor is discretion, in the which better part I have sav'd my life." Henry The Fourth, Part 1 Act 5, scene 4

You can save your life by your actions. While getting upset because someone ran in to you is normal, you have the ability act like a rational human being. It may save your life.

Falstaff:
To die is to be a counterfeit, for he is but the counterfeit of
a man who hath not the life of a man; but to counterfeit dying,
when a man thereby liveth, is to be no counterfeit, but the true
and perfect image of life indeed. The better part of valor is
discretion, in the which better part I have sav'd my life.
Henry The Fourth, Part 1 Act 5, scene 4, 115–121

Two real lessons here: Don't take traffic infractions personally. There are jerks out there who drive like idiots. Take great lengths to avoid meeting them. When you make the split second decision to use deadly force, there will be people debating if you were correct or not. Few things in life are black and white, and are mostly shades of gray.

In less than a few seconds this woman made a decision, good or bad, that will effect her the rest of her life. Consider it the next time some one does something stupid in traffic: Is any confrontation worth the possible outcome?