This study utilized ray tracing and back-ray tracing to optimally design road lighting for optimal visibility for drivers and pedestrians at night. While conventional road lighting focuses on ensuring sufficient brightness, recent developments require diverse characteristics beyond brightness to ensure optimal visibility for drivers and pedestrians, including reduced glare and uniform ground luminance. Existing road lighting was inadequate for drivers and pedestrians due to serious issues such as glare and uneven illumination. To address these issues, moving beyond capacitance-centric design methods and understanding the path light takes to reach the road surface is crucial. Optical simulation, which assumes a sufficient number of rays, is essential for achieving this goal. To achieve these goals, this study explored the application of ray tracing to the design of road lighting reflectors. Design goals such as uniformity of road area per single light, shading angle, and continuous luminance uniformity over long distances were established. Ray tracing was used to design the ideal road lighting conditions. Back-ray tracing was then used to design the road lighting reflectors. By reducing light loss, power consumption was reduced by almost half while achieving the same brightness on the road, and the shading angle was 75 degrees and the brightness uniformity of the road area was 0.6, achieving the ideal design criteria.