and no plugs on the end of the bars.
and from the world of MTB, how about the old-style bridge on the straddle-cable of canti brakes so that if the straddle wire jumped out of the bridge, or if the anchor bolt slipped, the straddle wire falls down and catches on the knobby tires and stops the bike instantly.
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever