Most dash cams (dvr) have a fixed lens aperture designed for average ambient lighting conditions. Unfortunately, in the real-world ambient lighting is not always average. Rising and setting sun or emerging from a dark tunnel can result in over or under exposed footage, possibly losing vital information such as number plates. HDR technology is designed to combat this by clever post image processing, to help produce a constantly clear and correctly contrasted recording. This technology also improves night vision recordings during night journeys.