May 27, 2021 · All you need to know about Road Studs (Cat's Eyes) Driving along a dark road, you might have seen occasional flashes of light emitting from some devices that have been installed on the road. These devices are called road studs, or cat's eyes (due to their design) or Raised Pavement Markers. These objects include a lens or sheeting that enhances their visibility by reflecting the light from headlights of vehicles and make the road visible to the drivers.