Whoa, some interesting comments here.
So, if you won't calm down to save gas or save wear and tear on your car.....what about slowing down to save your
life?
Stress is so
so hard on your heart and your health.
If you find yourself clenching your fists around the steering wheel, "racing" to beat the lights, and swerving in and out of traffic, you probably need another outlet.
Racing of some sort (motorcycles?), skydiving and white water kayaking might be sports you should look into to blow off some of that steam. Just sayin'.
p.s. yes I realize most of those sports mentioned aren't "green", but you probably offset the effect with better, safer daily driving.