A total of eight bridges have been built as part of this scheme, according to National Highways.
Among the most significant is Cockcrow Bridge, the UK’s first heathland bridge, which acts as a natural corridor for wildlife to cross the busy road.
The bridge, which is 30m (0.03km) long, connects Ockham to Wisley Commons and was installed in January.
In March last year, the old Clearmount Bridge was demolished.
National Highways said this produced 3,000 tonnes of material, which took 80 trucks more than 24 hours to clear away.
The new 450-tonne Clearmount Bridge was installed a few months later in November, as was the Wisley Lane Bridge.
This bridge provides access to Wisley Lane and the RHS Garden Wisley.
At the same time, National Highways permanently closed the existing access to and from the A3 at the old Wisley Lane.
The 58m-long Redhill Footbridge, the last of the eight bridges to be built, was installed in July.
There are still a few areas of the project to be completed, including the removal of temporary traffic lights at the Seven Hills junction and Painshill roundabout.
An alternative route for the San Domenico/Starbuck site has just been completed and will open by March, while the Cockrow heathland green bridge has been completed and will open in February once a horse path and cattle grid have been installed.