I agree, and perhaps self-driving cars are not yet ready for "prime-time". The solution for the current state of the art might also just be maintaining a lower speed with automated drivers, which may also necessitate limiting the types of roadway on which they can operate. A slower average speed shouldn't be a big problem for automated cars since they don't experience the frustration of human drivers. Given wide-enough adoption, accomodations can be made to traffic signalling apparatus, car-to-car communication, and car-to-cloud integration to develop near-seamless traffic flows, allowing shorter travel times even at slower speeds. From here the tech could be iteratively improved to provide faster speeds without compromising safety.