The works, carried out by Staffordshire County Council's highways team, will pave the way for the designer outlet West Midlands to open in early 2021.
The scheme will provide access to the £160 million development and improve traffic flow on surrounding roads. Despite the Covid-19 outbreak and lockdown restrictions, the project has been able to continue safely.
Helen Fisher, the council's cabinet member for highways and transport, said: "This has been a huge project for our highways team and for Cannock and the surrounding areas.
"We are pleased to have played our part in ensuring the right road infrastructure was put in place ahead of the opening of the MacArthurGlen Designer Outlet West Midlands.
“This development will provide jobs for local people and bring in thousands of visitors each week, providing a great boost to the county economy."
The construction of the development is on track to be completed this autumn. But the opening of the site has been moved back to early next year as a result of the impact of coronavirus on brands set to open in the outlet.