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Find I get more stress from riding busier SC courses like H10/2 and H10/1 than any DC course.
I think the worst course I ride regularly is the H10/10, a combination of drivers doing at least 20mph over the limit on the bendy bit of the Drift Road plus getting in the way at all the junctions. H[10|25|50]/1 and H10/2 are nice and wide for the most part, so you can give yourself plenty of room without being closer to the centre than the edge
Bisham roundabout can be busy, but I've never it particularly bad. Find I get more stress from riding busier SC courses like H10/2 and H10/1 than any DC course. I quite often use the A404 as a shortcut home from Marlow if I'm feeling lazy.