London's cabbies memorize 25,000 streets. But will robotaxis overtake them?

On ancient roads and in medieval alleyways in London, a very modern battle is brewing. Black cabs, which are as synonymous with that city as Buckingham Palace, will soon be competing with artificial intelligence-powered, autonomous taxis. Tech companies promise these AI inventions, some of which are already operating in several American cities, are safer and smarter than human drivers. But as we found out, London's cabbies aren't about to hand over their keys. …