Brandon Hansen has an interesting article about traffic where he analyzes data that he recorded for a period of a year. He kept track of his departure and arrival times both to and from work. After a detailed analysis, he concludes that he can save over 30 hours per year by simply moving his schedule out a half-hour!!
Perhaps one day our cars will be able to track and analyze traffic data for us automatically and tell us when the best time to leave the house is.