The extra funding has been allocated as part of the 2013/14 budget.
In a statement, the transport authority said its operating companies would fit the additional work into their current maintenance programmes for the trunk road network.
The projects benefiting from the investment include in the North, where the A90 at Stonehaven will be resurfaced and in the South, were major repairs are being carried out to the Dumfries bypass. Elsewhere, work to upgrade parapets on bridge structures from the A1 to the M90 will be included, as will the replacement of bridge joints on the M8, M80, M9 and A90.
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Transport Minister Keith Brown said: "This extra investment will help us will address some of the issues on road surfaces and structures across the country. It is something that drivers feel strongly about and we are responding to their concerns by using this money where it is required most.
"We have invested over £2.5 billion on our roads and motorways since 2007. In 2013/14 we are investing over £700m which will ensure we continue to deliver an extensive maintenance and improvement programme with road safety a key priority."
(JP/IT)
