“A Great Wee Road in my terminology just means a small road that isn’t a main route and which is fun to drive. Often it will be a short cut or at least an alternative route to the main road. It will virtually never be quicker than the main-road route but it will be a pleasure to drive, perhaps partly because it has less traffic, partly because it goes through lots of beautiful scenery and perhaps because it has lots of flowing curves, sudden dips, challenging hills and/or fast straights (though GWRs rarely have many of those). A GWR can be extremely slow – often way below the legal limit – and still be enormous fun, it can even be a single-track road, quite busy with traffic and so somewhat frustrating, and yet still be a hoot, and some roads only really become GWRs when it’s raining and you have to slow down.”
Excerpt from “Raw Spirit: In Search of the Perfect Dram”, by Iain Banks, which I’d recommend to anyone with a liking for irreverent humour and/or malt whisky.