What do we mean by road user aggression?

Road user aggression or aggressive road user behaviour is deliberate behaviour aimed at harming other road users physically or emotionally [3]. Examples of aggressive road user behaviour are tailgating, excessive horn honking, flashing one’s lights, yelling or making obscene gestures. The term ‘road rage’ is also often used, but its usage by different researchers is rather inconsistent and often hard to distinguish from the more general concept of ‘aggressive road user behaviour’ [3]; Galovski et al. (2006) as mentioned in [4]. Traffic disputes in which road users call one another names, lash out, run someone over, cut off someone, or even take shots at one another, may all be considered as manifestations of road rage.