With more than 5,000 repairs now carried out on the scheme, the majority of work is scheduled to continue until autumn with further work continuing into spring 2019.
Work on the southbound carriageway, between junctions 1 and 2, is approaching completion and in the coming weeks the entire operation, involving more than 500 workers, will transfer to the northbound carriageway.
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Overall, the scheme involves concrete repairs and waterproofing along a two-mile section of the ageing viaduct in the West Midlands. The development is believed to be the largest concrete repair project, by value, ever carried out in Britain.
Highways England senior project manager, Zbigniew Twarowski, said: "The scale of this project is vast and has involved a large number of repairs.
"On top of that we've had one of the harshest winters in years, which has added to the challenges.
"We will not know the full extent of the repairs needed on the northbound carriageway until work there is under way.
"We appreciate the level of disruption this project involves and I'd like to thank motorists, businesses and residents for their patience. Meanwhile, our teams are working as hard as they can to get the job done."
(LM/MH)
