Transcript for Cameras in Cars Turn Drivers Into Crime Fighters
Road rage and reckless driving and handing that video over to the real police. Here's ABC's Clayton Sandell. Reporter: The story starts with this collision on an Arizona highway. Oh! They just hit. Reporter: But after both drivers pull over each driver tells a different story. Both are free to go until the next morning when another driver who saw everything comes forward with the whole story. The beginning of the video recorded on a dash camera shows one driving swerving. Later revving the engine. Reporter: The Arizona road rage case is just the latest example of cameras in cars turning regular drivers into citizen crime fighters. When you have proof like this and it's undeniable what happened, it makes it a lot easier on us to prosecute. Reporter: In Ohio this driver was charged after video showed her swerving off the road. Stop the car! Reporter: Police say they appreciate the extra eyes and hoping that ultimately they help keep the roads safe. You never know, somebody is always watching. When we come back, the major recall tonight.
This transcript has been automatically generated and may not be 100% accurate.