These speak for themselves, for the most part. But it might be worth noting that none we’ve noticed have electric assist, either by hybrid electric or solar electric, which are both, we believe, in limited use around the world. From FrogMob, the mob-sourced section of the FrogDesign Blog1, Work Bikes: From the Cool Tools section [...]
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.