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The article presents the results of the research describing the changes of bicycle pedal angle relative to the ground, depending on the bicycle crank setting, and the impact of these parameters on detecting the reflective effect emitted by the reflective elements mounted on the bicycle pedals. The results of the road tests determining the cyclist detecting by a car driver, when bicycle is equipped only with bicycle pedals, reflective lights, illuminated with car's passing lights are also presented. The research described in this article has been carried out for the purpose of reviewing the causes of traffic accidents, occurring at night, in the areas not illuminated by the street lights, in which the cyclists using defective bicycles (according to the regulations) took part. [ABSTRACT FROM AUTHOR]