When not using a rear bag, I mount a light on my seatpost & position the triangle so the red, steady beam goes through the fabric portion of the triangle. Otherwise I have a red, steady light on my bag beside a triangle. When my son rides the stoker position of our tandem, he wears a reflective vest & when I'm pulling a trailer I have a large orange flag & large reflective triangle. I think reflectivity is the best, with lights really just helping to be seen from a further distance. I am no scientist.
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