Well folks -- keep in mind I'm discussing not cussing or arguinmg.
In realituy the flash from a windshield, piece of metal or signal mirror will get your attention if it strikes your eyes. The problem would not be in seeing, but rather in interpretation. In that case a mirror may be less effective.
As for the pen flare, it is very small and very short lived. One flare may or may not be sufficient. In a word -- IMHO the pen-flare sucks.
If you want signalling devices get some that work. I believe that the original premise was that these were for use on a small body of water. Any good boating supply store sells visual signal kits which will satisfy the U.S.P.B.S. or U.S.C.G. specifications for around $40. They include a flare launching device, flares and aerial flares or star clusters.
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