The A66 provides vital east-west connectivity between the Tees Valley, the A19 and the A1(M).
The road carries more than 70,000 vehicles daily on its busiest sections.
On the section of the A66 managed by Middlesbrough Council, as the local highway authority, approximately 75% of the carriageway is well beyond its normal life expectancy.
There are also critical issues facing the safety barrier system, bridge structures and sign gantries.
The condition of this section of the A66 presents a risk of weight restrictions, lane closures and ultimately structural failure, which would result in the road being closed.
This £20million package of work will include carriageway resurfacing, remediation work on bridges and structures, and safety barrier replacement.
It will ensure the future resilience of the road, with the interventions extending the lifespan of all assets to at least 15 years and in some cases many more.
Separately, there are several roundabout junctions between Middlesbrough, Teesport and Redcar, where £40million of interventions are needed to improve capacity.
These include:
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