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As the population arises everyday, road accidents also increase. More than half of all road traffic deaths and injuries involve vulnerable road users, such as pedestrians, cyclists and motorcyclists and their passengers. One of the many reasons is the lack of road lighting. Without sufficient road lighting, it is necessary to provide some means to guide the drivers along dark roads. Road studs are among the most important devices that help in preventing cars from running off the road or their lanes and making our roads safer. They reflect the light from a car's headlights to allow the driver to observe the curves and corners of the road from a distance. Even in the dark, the driver is easily able to see the road alignments, ends, and corners of the road and judge where to turn, what lane of the road to adopt and in turn, drive safely. This makes studs extremely useful on poorly lit roads. They provide effective night guidance even under adverse weather conditions. The aim of this study is to provide better understanding and to get an overview of the developments of road studs through time. The data collection has been carried out through the search engines Google Scholar and Google Search. Therefore limitations, selections and exclusions have been made by the authors. This study focuses only on the variables stated above, the effectiveness of road studs to road safety and visibility . The method for answering the research questions was conducted by systematic literature search and review.