I loved this ride, although we rode from bath to Weymouth with the misses on the back and loved it. I do agree that it's better in reverse, seemed more fun and abit faster. Half way down going south, watch out for the bit where you have walls either side, just keep the speed down through there, some tight corners. The only thing we didn't like, were the road signs to sherbourne when riding south. Other than that highly recommend it.
The journey over the hills, taken by going straight on at the Middlemarsh junction (a deceptive right hander when coming from the north) can be quite a good ride, too; some loooong faast straighs coupled with some bendy bits. Try it!
Thoroughly enjoyed this route so much I did it both ways. Challenging and keeps you on your toes, if you want to ride this route hard make sure you keep your whits about you and perhaps do it a few times to help yourself learn it. Will certainly be adding this to my usual Sunday afternoon ride out.
Ive been there in July-08. It was almost my first road in UK after reaching Plymouth. It was good with little traffic, but it has poor visibility.
Running partly along the length of the old Sherbourne road (the full section can be taken by exiting at Middlemarsh), this route takes in the stunning Cerne Abbas (the 55m high outline of a naked giant), the sweeps through Dorset into Dorchester, home of Thomas Hardy
Also well worth taking the left fork at Middlemarsh when travelling south - this takes you along the "Old Sherborne Road", & brings you out close to Dorchester town centre, avoiding the A37 completely. If travelling north, joining the A352 at Middle marsh needs care.
This route certainly beats the main road to Dorchester. Leave Sherborne on the A352 to Dorchester. Stay on this road all the way to Charminster then join the A37 for the last couple of miles to Dorchester. Some prefer this route in reverse. There are lots of bends, both fast and slow but they are hard to read. There are one or two open bends where you can see the road layout but most are concealed. Its very hard to get it right. Not much traffic here and no double white lines so easy to make progress.