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I'm looking for something that I can mount
on the rear of my bicycle that would alert me
to a bicycle approaching from the rear. I saw
a proximity device into which you could
record a message, but it was unfortunately
not suitable. Think of it, the device that
could say "#$%@%#%#$ approaching
rear". That would serve two purposes: A
warning to me and a reminder to the guy
approaching that he should have given a
||A mirror, but that would mount at the front of your bicycle.
||Silly, that would just be a couple playing cards arranged in the wheels of the 'overpasser' so that each spoke's passage snaps the card(s). This would simulate the sound of a motor-bike, and give you all the notice need.
||Too simple. Now, if each bike had an extended arm holding a playing card that sought out the other bike's wheel...
||...or a divining rod mounted on the handlebars but facing backwards.
||How about something like a pedal powered automobile windshield washer squirter that automatically squirts in an arc to the rear every few seconds? The cursing of those behind you would alert you to their presence, especially if you used a noxious fluid. It would work better than a swamp gas generator on a windy day, but not very well in the rain.