> The mean mileage for cars driven by humans before encountering an accident is 500,000 miles, compare that with 42,017 miles for self-driving cars. Self drivi

> The mean mileage for cars driven by humans before encountering an accident is 500,000 miles, compare that with 42,017 miles for self-driving cars. Self driving cars do not drive like humans and are harder to predict, causing accidents.