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The way I read it (with the same difficulty you mention) is that the charge is actually for 'assault causing actual bodily harm', and it seems that the journo has turned it into 'road rage', perhaps to make the headline snappier, or perhaps they were keen to say that pedestrians can launch 'road rage' attacks, too. Perhaps it was something said in court, e.g. in pleading guilty the defendant may have said 'it was road rage, really' (which obviously has no bearing on the charge).
Oh well.
Scrabble
Oliver Schick
As if to prove a point, you really get strange ways in which the term is applied. Here's one that to me doesn't look like 'road rage' in the slightest.
http://www.standard.co.uk/news/crime/millionaire-businessman-admits-driveway-road-rage-attack-on-pensioner-66-a3333086.html
Why is this 'road rage' rather than someone on a hair trigger flying off the handle in a completely random situation?