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Cycling trousers with visibility features use reflective elements on the legs. There is a specific reason for this: movement is recognised faster in headlights than a static surface.

Why reflection on the legs is especially effective

A pedalling leg creates a light signal that moves up and down. From this, drivers recognise not only that someone is there, but also that it is a cyclist, and in which direction they are moving. Reflective strips at the leg end or on the outside seam are therefore more effective than an equally large surface on the torso.

There is also side visibility. Front and rear lights cover the axis to the front and back, but at junctions the danger comes from the side. Reflective elements on clothing close exactly this gap.

On long trousers, the most effective strip is at the ankle. It describes the largest circle when pedalling and therefore creates the most noticeable movement. Reflective elements on the thigh move less and are noticed later.

Reflection only works with a light source. At dusk, when cars are still driving without lights, a strong signal colour also helps.