Two projects are set to be delivered over the next seven weeks on the route near Keswick in the Lake District.
Features include installing fresh road markings, new reflective road studs, new fencing and cattle crossing signals.
The first scheme will see £168,000 of overnight work delivered between Threlkeld and Scales. The project is due to begin on Monday, 13 June and will be completed by Sunday, 10 July.
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A further £500,000 project will get underway between Scales and Mungrisedale on Monday, 27 June, with completion scheduled for Wednesday, 20 July.
Most of the works will be carried out between 8pm – 6am, with some daytime working taking place between Scales and Mungrisedale as a section of the carriageway needs to be rebuilt.
Highways England project manager Peter Gee said: "This is important work to ensure local people, businesses and tourists can continue to enjoy smooth and safe journeys through this part of the Lake District."
(LM)
