Waymo, the self-driving car company owned by Google’s parent firm, Alphabet, plans to expand its current market-dominant position to other US cities, the firm said on Tuesday. Its robotaxis now make more than 150,000 journeys, driving over 1 million self-driving kilometres with passengers per week – without a human at the wheel. The company is currently active in San Francisco, Los Angeles, Phoenix, and Austin and more recently in Atlanta. It did not list other cities where it might be available. The chief executive of parent company Alphabet, Sundar Pichai, said Waymo robotaxis are becoming p…