The Welsh government says the road-building scheme has been one of the UK's "most technically challenging".
A British road which has had roadworks on it for 23 years - and cost more than £2 billion to fix - is almost complete.
The stretch of A465 Heads of Valleys road in South Wales is only 28 miles long, but if cost estimates are accurate it's cost more than £70 million per mile to fix.
As well as the road layout works, the BBC reports more than 70 structures,including more than 40 new bridges and a dozen new junctions, have been built.
Tony Blair was just starting as the British Prime Minister when spades first went into the ground for the project in 1996 near Merthyr Tydfil.
Speaking to the BBC of living with the ongoing roadworks for nearly three decades, one local resident referenced a famous popstar who wrote an iconic song about a nightmare road, saying: "It's like the road from hell, not even Chris Rea would dare come here."
WalesOnline reports work to convert the A465 into a dual carriageway began in 2002 and has been carried out step by step ever since.
The road links the M4 by Neath with the A40 dual carriageway at Abergavenny and ultimately the midlands of England. The final stage of the project - the section between Hirwaun and Dowlais - began in 2001 and is set for completion this summer.
The new road will be a 70mph dual carriageway with six junctions.
Wales' transport minister Ken Skates said: "This project is an incredibly impressive piece of engineering and a fantastic example of how targeted investment in road infrastructure can deliver on many levels, providing jobs for the local community, improving accessibility, supporting education and skills, alongside delivering environmental benefits.
"It’s been a complex project which has not been without its challenges, and I would like to thank everyone who has played their part in helping us to deliver one of the largest road projects in the UK.”
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