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Have you seen those new cars with big expensive HUD systems? They flash the pertinent information on your windshield to keep you informed while looking at the road.
Add the HUD functionality to any car using just your phone with this app. It reflects an information screen on your windshield, giving you the same capability as those expensive cars.
It also warns you when there are speed cams about so you can slow down.
aSmartHUD for iPhone -- $0.99