I bet self driving vehicles will eventually be so much safer and reliable than human drivers that there won't need to be a speed limit. The computer will know the fastest yet still safe speed to travel at and will go at that speed.

I think self-drive completely changes the attitude towards speeding.

'I don't want to be restricted! It's a challenge to me - my authority, my independance, I'M THE DRIVER!'

But if that person is NOT the driver - then speed restrictions suddenly become less personal, less a challenge to individual ego. It becomes more a matter of simply getting there.

I've always been ready for automatic driving. Can't wait to program where I want to go, sit back and read a book, or take a nap.

The challenge would be to make the self-driving cars unhackable, although, technically, most modern cars can already be sabotaged by the government if they want to get rid of a witness.

Autonomy will steadily increase over years to come and at some point we will hit the 'tipping point'.

20 years ago, cruise control was novelty and rarely used. It's now a standard/optional feature on most cars. Adaptive cruise is common on luxury cars and lane control is appearing too.

Bit by bit, we will start to accept more and autodrive features - in europe all cars now have ABS, stability control, traction control and a host of other features that take more and more control from the driver.

Fully autonomous cars cannot function fully until there are few driven cars left - the safety features would stop you pushing into queues on busy roads and would always give way to the aggressively manually driven car.

But it will come......