Argo AI, a robotaxi startup that has the backing of Ford Motor Co. and Volkswagen AG, said Tuesday it’s launching driverless test rides in Miami and Austin, Texas. The removal of human safety drivers is a milestone for the Pittsburgh-based autonomous vehicle technology company that was founded in 2016. “Argo is first to go driverless in two major American cities, safely operating amongst heavy traffic, pedestrians and bicyclists in the busiest of neighborhoods,” Argo founder and CEO Bryan Salesky said in a statement. “From day one, we set out to tackle the hardest miles to drive — in multiple …