That would be helpful. I have looked at it, but as has been demonstrated in our exchanges, the difference between tier 5 and tier 4 is not entirely clear. From the descriptions of the people who gave evidence to us, in tier 4, the human is removed entirely from the equation.

We need to consider this issue. The evidence that I read said that the Venturer experiment at the Bristol testing centre discovered that drivers, when they first took over, tended to be over-cautious and drive at slower rates, which could increase congestion. There was also the potential for danger in vehicles suddenly slowing down, and Mr Gooding said in his answers to our questions that he felt that that issue was more important than congestion.

There are some important considerations raised by the issue of transition, particularly in tier 3. We asked witnesses, “When will the vehicle decide whether it is safe for the vehicle to drive or whether the vehicle should be handed back to the human driver?” They said that it depended on road conditions. That suggests that it will happen in the same locations on our roads: for instance, as vehicles leave motorways and enter more built-up areas, where there are more potential hazards and dangers for vehicles, it is likely that the vehicles will transition back to being driven by the driver. If that will happen regularly in the same location, it could create accident black spots. We could create a considerable new hazard on our roads.