Trapster (Photo: Trapster)

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Platform: Android
Cost: free

While radar detectors are not legal in most Canadian provinces and some U.S. states, there are a few tools out there that use the power of crowdsourcing and social media to at least give you a virtual heads up when there could be police around. Trapster, a free Android-based app, uses the phone's internal GPS system to cross-reference your current location against the list of speed traps and red-light cameras that some 13 million users have entered into the system.

The bonus is that if a user posts a bogus trap, other "Trapsters" can vote on its credibility. The app displays blue lines where other Trapster users have recently patrolled, and the alert area changes shape based on your speed and direction of travel.

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