We're only just approaching the finish of a 30 year project to do that for the Pacific Highway between Hexham and Brisbane. It's a considerably higher traffic route, and shorter as well.
Despite the pollies claiming in December 2020 that the M1/A1 was now “dual carriageway from Sydney to Brisbane” with the completion of the Woolgoolga to Ballina section, it actually still isn’t that. That was a lie.
The A1 is still an ordinary highway going through multiple traffic lights in Coffs Harbour, and also from Black Hill (just south of Beresfield) to Raymond Terrace. That is
not a “dual carriageway” in my book.
The Coffs Harbour bypass, which has only preliminary works happening at the moment, won‘t be open until around 2027.
The M1 extension from Black Hill to Raymond Terrace will bypass a number of traffic-light controlled intersections with a new bridge over the Hunter River, to join onto the A1 just past Heatherbrae. It’s not expected to be completed until 2028.
The first section of the F3 (as it was called back then) from Hawkesbury River to Mt White commenced construction in April 1963. It was the first “freeway” standard road built in Australia outside of a capital city. If the M1 extension is completed in 2028, then it will have taken 65 years to convert the entire 1776 km road from Melbourne to Brisbane via Sydney into a proper 4+ lane divided highway with no traffic lights.
Only then can the pollies claim it is “completed”.