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On paper, bicycling is an excellent form of transportation. Not only are there some obvious health benefits, the impact on the environment is much less than anything not directly powered by a human. But let’s face it: riding a bike can be quite scary in…
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Miles Bader's profile photoJonathan Rockway's profile photo
 
It's very neat tech, but it's not really a great solution to the issue. Simply knowing that somebody is behind you just isn't really all that useful, and existing simple methods (e.g., looking, listening) are actually pretty effective....

[Better solutions are a lot more difficult, because they involve changing the way society, and government, treats transportation, reducing the obsession with motor vehicles, and changing the road network and urban landscape so that it isn't so insanely car-centric.]
 
Garmin already ships a radar-based gadget that does this. It's pretty interesting info to see a little map behind you; if there are a bunch of cars, you don't have to turn your head to look; you know you can't change lanes now. That said the battery stopped charging and I threw it away and I don't miss it much.
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