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I took mine off - blacked out bike - riding in the dark on the freeway right next to a lady in a car - she looks right at me and put her signal on and changed lanes into me. IF YOU TAKE THEM OFF - ASSUME PEOPLE CAN'T SEE YOU AT NIGHT..
There also laws about this - and it gives those small town speed traps another reason to pull you over...
You can have the the extra reflectors, strobe lights, flashing lights, reflective vest etc. and people will still not see you. Ride like you are invisable. (of course stap a gun to your leg and everyone sees it)