If autonomous cars reduce traffic-light response from 3s to 3ms there may be some temporary improvement. But a 3ms delay is still a delay and as traffic speeds

If autonomous cars reduce traffic-light response from 3s to 3ms there may be some temporary improvement. But a 3ms delay is still a delay and as traffic speeds and volume increase this delay will again become problematic. The realities of physics ensure that there will always be a delay and it will always lead to congestion as the pipe fills. We route internet packets at around the speed of light and still experience traffic congestion on those networks.