The iRadar smart detection system integrates with its free app to provide visual alerts and notifications for speed and redlight cameras, dangerous intersections, and known speed traps. It detects all radar and laser guns, so no nasty surprises on your road-trip.
Additional iPhone features include alert history and logging to keep track of recurring speed traps, as well as a speedometer and a compass. iRadar is available for $130 on Amazon. [Cobra iRadar via Uncrate]