In the new model, economic activity ends when the telephone call is placed. The money is made before the phone actually rings?from the presence filtering and social networking services.

At some point the drivers do come in and let us know what has happened. Usually what has happened is that they've panicked because they've run someone over and they've worried about the consequences, but from our perspective we'd prefer it if they'd just come forward, and we can deal with the ramifications afterwards.