Cars are keeping their distance,
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This review is from: Fibre Flare Micro Duo Red Rear Light (Sports)
Since using this light cars seem to keep a greater distance when overtaking. It is very visible and I now have fitted one either side of my bike to ensure visibility from each direction. The battery usage is very low, especially when using it as a flashing light, rather than constantly switched on. If you want to be seen at night, this is definitely worthwhile to take a look at.