While the United States Postal Service may be referred to as “snail mail” in this digital age, technology may soon change that. USPS has started using self-driving trucks to send mail. There aren’t any drivers to get fatigued or that will need sleep. While the test runs have a safety driver behind the wheel and an engineer in the passenger seat to evaluate everything, this is not the long-term plan. Eventually, the trucks will be able to transfer mail without needing a reason to stop.