Both routes are designed to higher standards than local roads, with features that support durability, safety, and resilience.The South West Scotland Transport Study (2020) highlighted their economic importance: the A75 west of Dumfries carries goods worth around £20 million daily, while the A77 south of Ayr carries £10 million daily, the highest HGV proportions in the region.Since 2008, significant investment has been made:A75: Six major schemes, including alignment upgrades, overtaking lanes, and the Dunragit Bypass, totalling over £50 million.A77: Five major improvements, including the £29 million Maybole Bypass opened in 2022...