Waymo, the self-driving ridesharing company, is mired in a growing number of safety incidents. While the company lately has been focused on launching in four new cities and transitioning to a new next-gen driving system, it faces a National Transportation Safety Board investigation over incidents in which vehicles illegally passed stopped school buses.Waymo is also contending with high-profile criticism after a viral video showed one of its robotaxis blocking an ambulance headed to the scene of a mass shoot ...