&quot;Robotrains&quot; are already fairly common: [1].<p>However, replacing road traffic with robots is more appealing.  Railways already have an almost-perfect safety record, and the cost of the driver is spread over many passengers.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_automated_urban_metro_subway_systems" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_automated_urban_metro_...</a>