HGV Blind Spots

On my commute yesterday, going past Kew Bridge, I was bumbling along and came up behind a HGV. The driver indicated left, and as the light started flashing, an audiable alarm could be heard (similar to when a HGV is reversing).

*Beep warning, left-turning lorry Beep warning, left-turning lorry Beep warning.....*

It was very clear and would make any road user instantly aware that a potentially dangerous manoeuvre was occuring. I think the vehicle's company was Cementex, but i didn't get a good look. Can't find any info about the system or company the vehicle belonged to, but will keep looking.

great idea, but very very useless if you don't speak English/deaf.