WASHINGTON, July 8 : The head of the U.S. National Highway Traffic Safety Administration said Wednesday that self-driving car companies must quickly address a "clear pattern" of driverless vehicles interfering with law enforcement and other first responders.Jonathan Morrison, who heads the U.S. vehicle regulatory agency, said in a letter to the industry that NHTSA has documented multiple instances of AVs driving into active emergency scenes, and other incidents when the vehicles "blocked the paths of ambulances and firefighters, or failed to recognize and respond to basic safety conditions like flashing lights, flares, smoke, fire, and traffic cones." "Let me be clear: the inability to detect and appropriately respond to such situations represents a functional insufficiency," he said in th