Nowadays the number of road accidents of pedestrians and bicycle riders is on the high level. All the actions tending to limit the number of those dramatic situations are very important. One of such an activity done by the road users is wearing the warning clothing equipped in reflective elements and materials. Warning clothing is very important element of prevention against the road accidents, which enables noticing the moving person in good and/or bad atmospheric conditions. Reflective elements placed on the clothing improve the visibility not only pedestrians, but also the other users of the road, for example, the road workers or bicycle riders. Therefore, in the paper there are described the problems dealt with the traffic safety and first of all concerning the reflective materials applied in the warning clothing.