Two accidents involving five vehicles happened just before 3:30 Friday afternoon on I-565 at Madison Boulevard. Traffic was severely backed up.
There were two SUVs and a pickup involved in the accidents.
A woman from Madison was taken to the hospital in critical condition. Huntsville Police said she was traveling west on I-565 when she went across four lanes of traffic, hitting another vehicle in the rear. She suffered a head injury.
72-year-old Freda Fraley is still in serious condition at Huntsville Hospital as of Friday night.
A second woman, 52 years old from Hartselle, was taken to the hospital for observation.
Emergency crews were on the scene, but they worry the scene may not be cleared until 6 p.m.