Another good one is the number of people that die in car accidents in the US every year, largely due to human error - 32,367 people in 2011.

If the government took one tenth of the money it spends on defense every year (which was $1.030–$1.415 trillion for 2012), or approximately $100 billion dollars, and invested it in driverless car research and the infrastructure changes necessary for it, a much bigger benefit could be wrought. But that won't happen, because it's the lobbying of the military-industrial complex that determines where money is spent.