GRINNELL, Iowa — Traffic on Interstate 80 was shut down for hours Friday night after a tractor-trailer crashed and burst into flames. There were two people inside the vehicle, but no injuries were reported. KCCI reports the crash happened in the westbound lanes near Grinnell. The Iowa State Patrol says the semi hit a guard rail. Some motorists were reportedly stuck on the interstate for more than three-hours, while others were detoured around the crash site.