The £28m investment on the A138 involves the building of a new viaduct and the demolition of the existing viaduct. In total, three lanes of carriageway will be laid down, as well as a shared footway and cycleway and a new footpath.
The work is due to be completed winter 2016.
Highways Agency east regional director Catherine Brookes, said: "Extra capacity along the viaduct will deliver significant economic benefits for both local businesses and motorists while helping to improve road safety.
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"The existing Chelmer Viaduct is in a poor condition, although we're content it remains safe for use at the moment. We have worked hard with our contractor to plan the work carefully to minimise disruption and are engaging with those affected to ensure they're aware of the work."
GRAHAM Construction is undertaking the contracted work. MD Alan Bill said: "Throughout the duration of this project we, as we do on all of our contracts, will work with the local supply chain and use subcontractors and suppliers from across the region as well as engaging with the local community to ensure there is minimal disruption during the course of this project."
Advanced works were completed on 26 January. The current work involves building foundation works for the bridge in both directions, while a temporary bridge and haul road near the Old Navy roundabout will be constructed.
(IT/MH)
