Heads-up displays (HUDs) are available for both cars and motorcycles. However, there's a fundamental difference between those vehicle types, and that's led to a UX problem for the latter category. Cars have a natural fixed surface on which to project the HUD, which is the windshield. With motorcycles, the HUD must instead be handled within the rider's helmet. Therein lies the problem. In a car, when you look around to check traffic, the HUD doesn't move. On a motorcycle, as you turn your head left and right at a stop sign, the HUD moves along with your head, staying firmly centered in your vision. Likewise when you tilt your head down to read your instruments. The persistent HUD can actually prevent you from seeing the very thing you're trying to spot. Swiss augmented reality tech company Aegis Rider has introduced a solution. Their Vision helmet contains a tracking camera that watches the motorcycle. This, coupled with a sensor fixed to the bike, can work out what the bike is doing relative to your head's position and angle. The helmet's software can thus keep the HUD data centered on the road: "Speed and navigation and more sit on the road ahead of you, anchored to your motorcycle, not to your head," the company says. "Turn to check a mirror or look into a curve and the display steps out of your way." It's a great example of really thinking the UX through. The Vision helmet comes in seven sizes, from XS to triple XL, and runs $2,000.