Solar radar speed signs provide visual enforcement of the designated speed and a proven ability to influence driver behaviour to reduce speed. The radar speed sign detects the speed of each vehicle as it approaches, displaying the vehicles speed in red when over the designated speed limit and in green when below. Radar Speed Signs are used as a traffic calming device in addition to, or instead of physical devices such as speed humps. Typically installed in areas where speeding vehicles are in close proximity to pedestrians such as school zones, construction zones, residential areas, and college campus. The unit is available in either a fixed or portable version. Drawing <0.8amp/h, the radar speed sign is simply and effectively operated using solar energy. The display brightness changes between day and night further conserving battery life.