The scheme, which was announced as part of the Programme for Government, will see repairs carried out at over 60 locations this financial year.
The extra funding will help accelerate resurfacing schemes to address road issues on 26 routes, as well as repairing potholes and reducing the need for further maintenance at a later date.
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Works will take place on the A82, A90, M8 and A77, while the Kincardine Bridge will also benefit with repairs being made to the deck of the approach spans and parapets will be repaired on a number of smaller bridges.
Transport Minister Humza Yousaf said: "Scotland's trunk roads are one of our largest assets and they are fundamental to our economy, supporting our key industries.
"The Scottish Government has invested more than £6.5bn in the network since 2007 and we are proceeding with major projects like the dualling of the A9 and A96 as well as the Aberdeen by-pass.
"And while our trunk routes overall remain in good condition, it is clear that extra investment could make further improvements.
"We have allocated this additional funding to allow the work to go ahead in this financial year and around sixty extra maintenance projects are planned in the coming months."
(LM)
