Google however does have the ability to hand over the cost of insuring such a system to the consumer, so even at current accident rates the cost is around 100 dollars a month per car using such a system (driving 12000 miles in a year). This equates to something like a cent per mile. So let's say they want incredibly high quality insurance, charging an extra 5 cents per mile won't make a difference in the scheme of things should they be able to get the overall cost of commuting 15 miles (the average American commute in one direction), to something under 5 dollars.