I think there need to be more enforcement on inattentive driving. This would include cell phones, eating, putting on make up loud music and other things that are causing a driver to not pay attention to their driving. If we get some of this under control then maybe the road rage will be diminished somewhat.
I am not saying it a perfect answer but it is usually the driver who is not paying any attention to the road that is causing the others to lose their tempers.