All the actions tending to limit the number of road accidents are very important. One of such an activity done by road users is wearing the warning clothing containing reflectivematerials and elements. Warning clothing enables noticing the moving person in good and/or bad atmospheric conditions. Reflective elementsplaced on the clothing improve the visibility not only pedestrians, but also the other road users, for example, bicycle riders. In the paper there is presented the designed project of warning clothing – bicycle rider jacket and there are presented results of questionnaire and of visibility measurementsof jacket on the road in the darkness.