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I always look behind Ed. I am 100% aware of what is behind me in terms of predictable solid objects. What I don't expect is a source of light coming from something that is not occupying that position in space at that moment. Say it takes 1 second to travel the distance between bike and projection and you are basing your movements on that, 1 second is a long time on a bike and it fucks your whole timing up.
This is my initial thought after having only come across 2 and my instincts tell me they are dangerous. And I am also struggling to see who the light is aimed at. Not cars because what driver is looking 4 feet ahead of them at the road? Pedestrians are the only people I can see benefiting from this and the fuckers should just look up from their phones before they cross the road
The difference between a Blaze and regular flashing lights is that with regular lights, the source is obvious. As stated above, when a Blaze symbol creeps up from behind, it's pure supposition as to where behind the rider is, and if there are more than one, it's very confusing, and if it's confusing for a cyclist who understands the context, imagine the reaction of an uninitiated driver (assuming they've noticed it in the first place).