Railways are a far simpler environment for driverless technology but there is not a single high speed railway in the world that does not have a driver up front. As for driverless cars, I remain to be convinced that all the sensors required will receive the aircraft standards of maintenance that they will require or that they will operate when caked with the muck thrown up on typical northern European winter roads. A few months ago there was a piece on the BBC 6 o'clock news from their transport correspondent reporting on Volvo driverless development. He said they were running on a test track as they could not go on the road as it had been snowing and the sensors needed to see the white lines!