But Steven Curtler, product safety manager at the ElectricalSafety Council (ESC), said Catherine's case highlights how current guidelines for manufacturers are not good enough.
In his Google blog post, Mr Thrun - professor of computer science and electrical engineering at Stanford University - insisted that safety was the "first priority" in the project.
In May, auto industry officials and the National Highway Traffic Safety Administration (NHTSA) and the Energy Department discussed potential dangers faced by first responders from electrical charges produced by hybrid and electric cars.