Some suggestions for reducing stress and aggressiveness while driving might include all of the following EXCEPT:

Do not Be an Aggressive Driver
How you feel before you even start your vehicle has a lot to do with how stress will affect you while driving.
Reduce your stress before and while you drive. Listen to easy listening music.
Give the drive your full attention. Do not allow yourself to become distracted by talking on your cellphone, eating, etc. Be realistic about your travel time. Expect delays because of traffic, construction or bad weather.
If you are going to be later than you expected, deal with it. Take a deep breath and accept the delay. Give other drivers the benefit of the doubt. Try to imagine why they are driving that way. Whatever their reason, it has nothing to do with you.
Slow down and keep your following distance reasonable.
Do not drive slowly in the left lane of traffic.
Avoid gestures. Keep your hands on the wheel. Avoid making any gestures that might anger another driver, even seemingly harmless expressions of irritation like shaking your head.
Be a cautious and courteous driver. If another driver seems eager to get in front of you, say, be my guest. This response will soon become a habit and you won't be as offended by other drivers' actions.