Enhanced Performance and Safety
Fundamental Human Factor led principles of HUDs, developed and proven over many years for avionics and cars, are translatable to not only motorcycles, but any human transportation moving more than fifteen Miles Per hour (MPH). Researchers agree that the chief benefit of the HUD is the significant increase in the time the rider spends "eyes-on-road" versus “eyes-down". Intuitively, this will reduce the probability that the rider fails to detect a time-critical event in front of him.
Another general benefit of HUDs is that eyes refocus much faster when switching from the road to the HUD image, which typically is accommodated by the user or “floats”, several meters in front of the eye. This benefit means that the use of HUDs will lead to a reduction in the number of road traffic accidents involving motorcycles.
Other well documented human performance benefits include simplifying the combined tasks of driving safely, monitoring vehicle speed and performance, and navigating to the destination.
HUDs can reduce rider fatigue when managing vehicle information while paying attention to the outside world. A well-designed HUD should provide conformal imagery perceived as genuinely part of the real world. A HUD aligned close to the driver's line of sight enables the intuitive display of superior features such as night vision enhancement for example.
Quoted Report from the US National Highway Traffic Safety Administration (NHTSA), published in 1995.