The structures at the Saddlebow interchange in Kings Lynn were damaged last October after being struck by an over-height vehicle.
Features included jacking the bridge, hydro demolition of the bridge deck, removal of the steel edge beam, replacing the damaged beams on each bridge, and concreting the deck.
New footage released by Highways England shows two 28-metre long beams, each weighing 10 tonnes, being lifted into place on the bridges.
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The project was completed as part of a wider £18m package of work to maintain the A47, which has included resurfacing, bridge strengthening, replacing street lights, repairing drainage along with safety improvements and renewing signs and road markings at key locations along the road.
Highways England project manager Ajith Nair said: "We're very grateful for drivers for their patience while we completed this vital work. This footage shows the amount and the scale of the work we've been doing, and will help drivers to realise how busy we've been and why the roads over the bridges needed to be closed while we were repairing them.
"Safety is at the heart of everything we do at Highways England, and this work we have been doing on Saddlebow Bridge and elsewhere on the A47 will improve both safety and journey quality for drivers."
(LM/MH)
