> Why can't London subway be a traffic-immune taxi service ? The system you purpose would not be traffic-immune. A large train full of people is incredibly ef

> Why can't London subway be a traffic-immune taxi service ? The system you purpose would not be traffic-immune. A large train full of people is incredibly efficient. You are describing autonomous cars, which will be great and given the the size and number of roads they don't need to match the efficiency or rail lines.