I stumbled across this road when cutting across from the A1 to the A68 a series of bends of all types with a few reasonable straights and for a B class road a good surface the series of bends at Humbie had me turn round and do them again
Travelling to/ from the ferry? Bored on the A75? Heres a nice detour to make u smile. After Annan, take a right and follow the signs to Dalton. Pretty much every road leads there! Go through and out of the village and youve two options - straight on through Lochmaben (then back to Dumfries on the A709) or take a left and go up over the hill back to the A75. Either way you get some great sprints, wicked bends and a great distraction that only adds 20 minutes or so to your journey.
Take the B377 from Exeter to Crediton this first bit is quite boring but after crediton the road gets Interesting. Then from Crediton to barnstaple (beware of a bad right hand bend about a mile out of copplestone.