Sorry but I disagree again. My old chums at the CPS have the following on their site on the charge of dangerous driving:
Dangerous driving can therefore cover a range of behaviours from a single error of judgement to a prolonged and deliberate course of driving with disregard for the safety of other road users. It is important to recognise that a single inadvertent act or omission may possibly fall so far below the standard of driving of a competent and careful driver that it constitutes dangerous driving.
It is not necessary to consider what the driver thought about the possible consequences of his actions: simply whether or not a competent and careful driver would have observed, appreciated and guarded against obvious and material dangers.
I think it is certainly arguable that the driver has fallen foul of the highlighted sections i.e. the single act of driving away from traffic lights in a 2-tonne lorry whilst not actually looking at the road does, imo, constitute falling so far below the standard of a competent and careful driver as to be dangerous. Thus, I would like to have seen the counter-argument that this wasn't the case properly tested in court.
And is it the case that, once the CPS decide to press a charge of careless driving only, it then becomes a decided advantage for the driver in question to confess to the nature of his incompetence, and thus also end up with a reduced sentence for his seeming co-operation and contrition? So the CPS effectively decide to take the 'safe' option as far as prosecution goes and the defence then take the 'best' option as far as sentencing goes.