The bridge has been developed on the Plymouth side of the roundabout and will let pedestrians walk between Saltash and Tamar industrial and retail estate.
The 66-tonne structure was officially opened at a ceremony attended by Sheryl Murray MP on 10 August.
It is understood 24 tonnes of reinforcement steel, 2610 tonnes of aggregate and 500 litres of paint were used during construction.
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The bridge was developed as part of a £3.2m package of works at Carkeel roundabout, which included improvements to the westbound approach and exit at the roundabout.
These improvements will increase traffic flows and reduce overall queue lengths at the roundabout. The provision of an additional lane on the approach to the roundabout will provide additional capacity.
Roads Minister Andrew Jones said: "The new footbridge is a vital part of improvements on this section of the A38 in Cornwall.
"This footbridge will make journeys better for local people ensuring they have easy access to jobs, shops and leisure facilities nearby."
(LM)
