A Waymo vehicle in downtown San Diego in March. (Photo by Adrian Childress/Times of San Diego) Some San Diego city councilmembers are asking for authority to regulate driverless taxi services.They’d like to limit the number of cars, where they can charge and park and how often empty they can roam city streets. On Monday, councilmembers will consider formally requesting state lawmakers give them the authority to make those decisions.Councilmember…