A nag always knows the way back to its own stable and, left to its own devices, will always head there.
A farmer could sup all night, tell the old tale and his cob would take him home.
The Google car will do this a little faster than a nag – but not much faster – it only does 25 miles an hour.
The test cars will be out on the roads within twelve months, says Google.
The cars could revolutionise social life. Who wants to go out to dinner these days if you have to drive?
Suddenly the drink/drive issue dissolves.