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Some vehicles do have this feature, but normally only when reversing. Delivery lorries often have whooshy noise and some have a shouty woman voice.
@spindrift for me if I saw an HGV straddling two lanes I'd first ask myself "why" before assuming, regardless of road markings or signalling. There's a part of the highway code on HGV's swinging out as they turn, and another about holding back and waiting if there is a signal on any vehicle because it could be erroneous.
This case involves traffic stopped at lights. If your face is in-line with a bloody great HGV it's reasonable that you can see their indicators, and you have effectively undertaken them on their nearside (and into a blind spot). If the traffic is stopped it's reasonable to filter, but only when safe to do so - I'd consider a vehicle straddling two lanes with its indicators on not safe to filter past.
Just had a flashback to an almost exact version of this happening to me on Walworth Road turning left onto Heygate. I filter, spinning down the nearside thinking I have time, getting caught nearly halfway down the HGV as it commits to turn after the lights turn green. Totally my fault.
If this happened to me, I'd put myself almost 100℅ to blame.
Riding bikes is safe, if you take care. But your bike offers no protection from error either by you or others.
I know that many people make mistakes while driving all the time. I reckon almost every driver would fail a driving test on every journey if it was reviewed by an assessor.
I know that the lorry driver made a mistake, but that's what people do. It's my job, in preserving my own soft fleshy body to try and make sure that when people make mistakes I'm not in a position to be squished.
I think in anything, this case shows the importance of audible signals on hgvs when indicating. I find indicators a frustrating thing to interpret. Particularly difficult in rows of traffic. An audible "this lorry is turning left" would likely have stopped her putting herself at risk.