Don't worry too much about it - unless you ban all existing cars, we're stuck with the mixed traffic for the foreseeable future. Once you're 100% robotic, you c

Don't worry too much about it - unless you ban all existing cars, we're stuck with the mixed traffic for the foreseeable future. Once you're 100% robotic, you could just use smaller cars to get more effective lanes instead of increasing speeds. Not that you could increase speeds safely - SDCs still need to brake in time, and they're bound by the same laws of physics, and there are still blind corners in the future.