General Motors EN-V Concept Car

The most significant feature of the vehicles is their ability to operate autonomously with the occupants doing other things while the cars drives automatically. Accomplished through a combination of GPS, vehicle-based sensors, and vehicle-to-vehicle communication, this autonomous technology is an extrapolation of that found in GM's 2007 autonomous “The Boss” Chevrolet Tahoe created for the DARPA Grand Challenge (2007). The EN-V can detect and avoid obstacles--including other vehicles--park itself, and will come to you if you call it on your mobile phone.
The EN-Vs can communicate with each other allowing platooning, with one or more EN-Vs tagging along automatically behind a leader. Also, if a EN-V detects another by radar, it can check what that other is intending to do and agree on how to pass it safely.