Doris A. Norman, 76, of Wentzville, was southbound on Hwy. 79 at T.R. Hughes Boulevard Saturday afternoon when she failed to yield to another vehicle.
The front of Norman's 2012 Mazda 3 struck the rear of a 2012 Ford Escape driven by Larkin C. Bennet, 55, of Old Monroe.
Bennet sustained minor injuries in the accident and was transported by ambulance to in Lake Saint Louis, the Missouri Highway Patrol reported.
Bennet was wearing a safety belt.
Norman, who was also wearing a safety belt, was not injured.