It would be more efficient and safer to have wires buried beneath roads which show correct positioning and transmit info regarding which road it is, direction etc in case of gps position errors or failures
Self-driving becomes orders of magnitude easier when you start making these sorts of changes to road infrastructure, yes. The conceit that needs to be made is that it isn’t going to happen
His suggestion is reasonably cheap, however. The sawing machines already exist for embedding the car sense wires at traffic lights. Reusing traffic lights (where there will be power and may be a telephone or other connection) could work for this.
That would be great but the cars still need to work if the wires buried beneath the road aren't working, are placed incorrectly, are transmitting bad data, etc.
I think something like this is inevitable. It would also make it much easier for cars to do basic things like following the road, without having to rely wholly on cameras and/or lidar. I definitely expect road infrastructure to change somewhat to accommodate driverless cars, better and more standardized striping if nothing else.