The A31 was closed for two weeks following the devastating wildfire in the New Forest in August.
Work will begin on replacing the M6 Thelwall Viaduct's joints on 1 September.
Knights Bridge is named after Valerie Knights, who came to the aid of accident victims on the A47.
Several organisations reported losses after the A31 was closed due to a wildfire in the New Forest.
National Highways confirmed the route reopened on Saturday morning with some speed restrictions.
The repair work has led to large traffic jams between Gloucester and the Forest of Dean.
National Highways has confirmed the route will reopen on Saturday morning.
Damaged joints have been found on the bridge despite a recent comprehensive replacement project.
Work continues on the A31 dual carriageway through the New Forest that remains shut following a van fire on 9 August.
