I believe it was this letter, but I don't feel like spending the $18 that Macmillan wants to let me look at it.
*Nature* 289, 344 (29 January 1981); doi:10.1038/289344e0, Motorbike safety, G. K. MCGINTY, Redhill, Surrey, UK The author analyzed the change in angular size of a single headlight travelling at reasonable speeds, the time it took for a motorist to look both ways before pulling out from a cross street, and concluded that a single round headlight of typical size would, in fact, be below the angular resolution of human vision at just the right moment for the motorist to pull out directly into the motorcycle's path. Perhaps not completely invisible, but too small to correctly judge distance or velocity. Not long after, motorcycles began to appear with the double wide headlights that have become standard equipment. -- rec --
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