a fit of violent anger by the driver of an automobile, especially one directed toward and endangering other motorists or pedestrians.
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British Dictionary definitions for road rage
aggressive behaviour by a motorist in response to the actions of another road user
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012