The new road will allow vehicles to travel in one direction through two separate tunnels.
Sanral also confirmed that it is still in contact with scientists who want to build a big laboratory deep underneath the mountain.
For more financial news, go to the News24 Business front page.
The SA National Roads Agency (Sanral) is making headway in its estimated R4-billion project to build a second road through the Western Cape's Du Toitskloof mountains by upgrading the Huguenot Tunnel north bore.
Tenders for the project are expected to be issued before the end of the year, and contractors are expected to be on site by the first quarter of 2025, said Sanral project manager Tiago Massingue in a written response to questions from News24.
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