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The whole point is that lorries in their current form have huge and uncheckable blind spots. They're dangerous, no one's denying that, but as long as they're on the road - watch the fuck out.
So, if the blind spot is uncheckable then wait before turning, a period of time long enough for a vulnerable road user on your inside to have transited the blind spot.
Exactly as we do as car drivers when changing lane on a multi lane carriageway.
The whole point is that lorries in their current form have huge and uncheckable blind spots. They're dangerous, no one's denying that, but as long as they're on the road - watch the fuck out.