County council leader Dan Harrison said the opening was “an important milestone” for local communities.
“It’s wonderful to see the new bridge open and to provide something that will serve the area well for many years to come,” he said.
“As well as improving a key route, the project has supported local jobs, businesses and young people, creating a positive legacy beyond the bridge itself.
“The A6006 is a vital link, connecting people to the airport and freeport developments, and we’ve worked hard to deliver a high-quality, future-ready bridge while keeping disruption to a minimum by building it alongside the existing structure.
“We know the work has not been without inconvenience, and I’d like to sincerely thank residents and businesses for their patience and support throughout.”