Virtual headlight flashing for the iPhone
NMobile and Trapster are two mobile applications that provide up-to-date, detailed maps of speed-enforcement zones with live police traps, speed cameras or red-light cameras. After launching, each application pulls up a map pinpointing the locations of speed traps within driving distance. An audio alert will sound as vehicles approach an area tagged as harboring a speed trap.
Both applications rely on the wisdom of the crowds for their data.