Amazon has entered the robot delivery market with the Amazon Scout.
The electric battery powered Scout has six wheels and travels at walking pace. Six robots are being trialed and are currently delivering packages during the day in the U.S. state of Washington.
Progress in machine learning has made navigation for this sort of robot easy to handle. That said, to begin with the robots will be monitored by humans to ensure they can safely and efficiently navigate around pedestrians, pets and other third party obstacles on their delivery journey.