The U.S. Postal Service is experimenting with self-driving trucks to move mail across state lines. The USPS has partnered with San Diego-based TuSimple on a two-week pilot programfocusing solely on a 1,000-mile route between Dallas and Phoenix. TuSimple's chief product officer Chuck Price told NPR the test runs, which began on Tuesday, will...

Mail trucks are bursting into flames at a rate that would trigger a massive recall if they were passenger vehicles. More than 120 fires have occurred in the past five years, including 12 in the first four months of this year. News and social media photos show the trucks burning intensely, often...