On the contrary, in the case of HGV's fitted with these gimmicks they are beyond useless, each individual led as it illuminates is nowhere near bright enough, on a bright day the driver might as well not bother to indicate at all. Blowed if i know who thought these were a good idea on trucks or PSVs but it will have been someone who spends little or no time out on the road.
In cars fitted with them its had a good effect, whereas the use of indicators was fast disappearing having these things to impress others with has seen a resurgence of indicator usage, sadly this hasn't morphed into useful indicating at roundabouts.
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