An 18-year-old Bosworth man had serious injuries when he ran into the back of a vehicle that slowed as they entered a construction zone. State Troopers report the crash occurred Monday at about 12:40 pm on US 24 near Keytesville. An 82-year-old woman was westbound and entering the work zone when she was struck from behind. The woman was taken to Moberly Regional Medical Center with minor injuries. The 18-year-old was flown to University Hospital in Columbia.