Templeton classifies these cars of the future into two types:
"Whistle Cars – Self-driving cars that can ferry themselves to drivers in need of a car at low, safe speeds. Smaller cars will be more viable, as customers will be able to order up a car that fits their needs for that day, rather than bigger vehicles that may be needed across its entire lifecycle.
After a whistlecar putters autonomously to its destination, the person renting the car takes over and drives it at standard highway speeds.
Robocars – Completely autonomous cars that take no user interaction to reach their destination. These must be extremely safe before public perception will shift to allow them on the road."