road rage 
noun [mass noun]
Sudden violent anger provoked in a motorist by the actions of another driver.I'm in the middle of watching ‘Band of Brothers,’ and getting accustomed to the vocabulary of warfare, but it doesn't mean I'm going to implement such tactics during spells of road rage....
- I was disgusted with this guy's driving skills, disgusted with the macho attitude, and those of you who have ever driven with me will know I suffer from chronic road rage.
- This reduces the myth to history's earliest account of road rage, complete with an autopsy report.