"In darkness, objects on the roadway without active lighting merge with the dark from the driver's seat and become practically invisible. Furthermore, the driver may be blinded by the headlights of oncoming traffic. A pedestrian or cyclist illuminated by an approaching car believes they are visible to the driver. However, this is not the case – a person on the roadway becomes visible at a distance of 25-30 metres at best. At a speed of 90 km/h, a car covers this distance in about one second. Even at a speed of 50 km/h, the stopping distance exceeds this distance. Therefore, it is extremely important to use retroreflectors, and to do so correctly."
Where and how to attach a flicker?
the luminous tape should be tied to a sleeve or trousers; the pendant should be attached to clothing or a briefcase, a bag; cyclists are obliged to wear clothing or special vests with retroreflective elements.