A Walmart truck got stuck under a railroad overpass Monday morning, blocking a rural Marion County road in both directions, the sheriff’s office said. The trucker driver, 63-year-old Glenn V. Bickford of Coos Bay, told deputies he misread the height restriction sign on River Road and thought his truck and trailer would fit. The trailer is 13-feet, 6-inches tall. The underpass is restricted to 12-foot, 9-inch tall vehicles. Bickford was following the advice of his truck’s GPS system to navigate between Salem and Monmouth.