This app wants to spy on bad drivers, but it's really all of us, too

The idea behind app Nexar is ambitious: create a type of air-traffic control system for the road. Catalogue the cars in a given location, track dicey behavior and help drivers avoid dangerous intersections and even bad drivers. Nexar is a free dashcam app that, using artificial intelligence, creates a database of an area's roads and drivers. If car stops short in front of you, even a few cars in front of you, Nexar's database can send you a notification so you'll have more time to brake. If an accident happens around the corner and cars are getting detoured onto your route, the app will tell you.