Lyft Inc. is starting to offer Waymo robotaxi rides in Nashville, marking the second US city where it’s providing driverless trips as it plays catch-up with rival Uber Technologies Inc.Through the partnership, first announced a year ago, Lyft customers may be matched at no additional cost with a Waymo autonomous vehicle when they order a regular ride, the companies said in a statement Wednesday. In order for a match to happen, the desired route must start and end within Waymo’s existing service ...