The B7076 and B7078, Scotland
The B7076/B7078 is literally the road less travelled. Starting at Gretna near the Scottish-English border, the B7076 runs north before the B7078 takes over, carrying on to Lesmahagow 23 miles south of Glasgow. Or the other way round if you're heading south. We often take this route from Glasgow down to Dumfries & Galloway. There are definitely more scenic roads in the UK, but this is my favourite.
There's something about it that doesn't quite add up. It's very spacious for a B-road, with dual carriageway in parts and generous verges. Traffic thunders up and down the M74 which runs alongside, but this is usually empty. It feels like discovering a secret passageway in the British highway system. It has the feel of another country like America or Australia - somewhere that has great open roads but hardly any traffic.
Like Miss Haversham, it has an air of faded grandeur. This is what happens when roads themselves get overtaken. Until the 1990s this was the A74 which was the main route between Scotland and England. Thousands of vehicles thundered up and down this every day until it all got too much and the 6-lane behemoth, the M74 was built. I thought road classification had something to do with size as B-roads are usually little things, but in this case it just means no one cares anymore. It had been superceded and is now demoted, put down a peg or two thanks to its shiny new neighbour.