Why useless?? They give low level close lighting when performing manouvers.. In lanes I often turn my fogs on with full beam for the completeness of light they give!

To highlight things 2 ft from your bumper that is too late for even steroid developed russion athletes. ....
Might make you feel better but ultimately pointless unless you aim is to blind and piss off anyone coming the other way.
 
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Get used to people saying "you've got a light out mate" I'm fed up of explaining the corner function lights. They are ok for roundabouts, other than that not much use.
 
I find that they light up the edge nicely when I'm negotiating the many I come across and that's about it really, like I said not much use otherwise.