My biggest curiosity is... what if someone hires my car and drives it across the country. How do I get it back? Are there geographic radius limits you can place on the vehicle hire?
Smart cars will be used, but for old cars the technology exists to unlock and use these cars using the mobile, installation is needed however. Although probably not reaslitic for cars as old as 20yrs.
The Whitepaper does have more details:
https://goo.gl/eygwwtThis is because, the technology does not stand still. But if the service is constantly reformed, then it will always be topical. And I hope that this will be so.