A one-vehicle accident occurred April 10 at approximately 6:19 a.m. A 2019 Mack semi tractor pulling a 2015 Vanguard trailer, driven by Mosezell Boone Jr., 55, North Kansas City, Mo., was traveling east on US Highway 400 when the driver experienced a medical event causing him to lose consciousness. He ran off the roadway to the south where the vehicle struck a tree and entered a creek. Boone wa...