Don&#x27;t worry too much about it - unless you ban all existing cars, we&#x27;re stuck with the mixed traffic for the foreseeable future. Once you&#x27;re 100% robotic, you could just use smaller cars to get more effective lanes instead of increasing speeds.<p>Not that you <i>could</i> increase speeds safely - SDCs still need to brake in time, and they&#x27;re bound by the same laws of physics, and there are still blind corners in the future.