The report starts by explaining the basic “language of light” and defining the terms and quantities it uses. The night-time value of simple road markings and signs is then explained, stressing the importance of retroreflective materials. This leads to the role of vehicle lighting, with particular emphasis on the need for individual drivers to take responsibility for cleaning and aiming. A chapter on fixed roadway lighting deals with the basic design of simple installations and explains the many different factors that need to be considered. Because of its importance, maintenance is considered in a separate chapter. Finally, there is some general lighting-related material for use in road safety campaigns.