... and someone(biker) in my rear view have his/her highbeam on and i cant see whats following us/if any, i get a little worried as i always want to know whats going on behind me(my plates is at the rear).
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Does this not support the point that high-beams can be counterproductive? If the rider behind you had High Beams on and you can't see what is going on do you think he has increased his visibility or reduced it?
..Tom