De signaalfunctie van fietsverlichting : bijdrage voor Achtergronddocumentatie ten behoeve van de actie "Fietser laat je zien" Veilig Verkeer Nederland, Hilversum, 1981, blz. 10 t/m 14, p. 23-24.

The chance for a collision between a cyclist and a driving motor vehicle, is much greater in twilight and darkness than in daylight, especially on unlit roads. As the lights on the bicycle often do not work it might be advisable to give bicycles a white reflector on the frontside. The SWOV wants a better division of the light all around the bicycle than the ISO proposition does.