Anger that is contained within boundaries can be safely expressed. Keeping your anger boundaried is not the same as controlling it. A chain of internal events takes place when we experience boundaried anger.
Imagine for a moment that you are crossing the street. A driver swerves to avoid you - although you have the right of way. You are shaken and angry. You feel afraid. You could have been injured or killed. You choose what to do next. Your intention is to show you outrage. You act by yelling at the driver.
The sequence is always the same:
REMEMBER: Remember to breathe.
Stay as focused as you can.
REMINDER: No hurting yourself.
No hurting others.