I was thinking it would work for the end-user a bit like cruise control. You drive you car to a highway that supports this form of driving. You press a button a

I was thinking it would work for the end-user a bit like cruise control. You drive you car to a highway that supports this form of driving. You press a button and you essentially let the authority of that highway drive you to your destination (or selected exit of that highway). A central authority can handle coordination, change of environment, safety much better than a single agent.