Moreover, wearing retroreflective strips on moving joints of the body like arms, knees, wrists, and ankles has also been shown to greatly increase pedestrian visibility. A study found that participants in a moving vehicle noticed pedestrians who wore retroreflective strips on their arms and legs at distances that were 10 times longer than when the pedestrian was just wearing a retroreflective vest on their chest. This is called biological motion or biomotion…

A pilot study that I led compared the visibility of bicycle mounted lights and bicyclist worn retroreflective materials on roads during both night and day conditions. In this study participants driving a vehicle on a public road, and the distances at which they were able to detect bicyclists equipped with different kinds of visibility enhancing devices like flashing lights, steady-on lights, and biomotion bands were compared. Flashing head and tail lights were detected from farther away than biomotion bands during both day and night.
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