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Saw a video on youtube last week that looked like exactly that, some 600cc sport bikes going for it for around 10 miles between two towns, absolutely on it the whole way, thought nah they must get picked up somewhere, locals enraged etc, but saw a few folk say the same as you, basically no one left in these places to be worth enforcing/bothering them etc.
Might be off to spain end of summer then, might need a faster bike with smooth tyres though.
BrickMan-
I'm not sure you need a sports bike to have fun. There are mountains in most regions so lots of the roads are very squiggly. They're like B roads, but usually without pot holes. And in the dryer parts there aren't hedges, so you can see through all the corners. The hard part is finding interesting things to do in the evenings.
nick_h.
Not many people doing high speeds there, I think they laid that surface for the benefit of the many cyclists, who bimble along two abreast taking in the aroma of the Redwoods! Low speed limits too. Could be very tricky trying to make the most of it on your 'sickle. Better to go to rural Spain, where all the locals have deserted the farmland to live in cities, leaving behind some very squiggly roads resurfaced at huge expense with EU money. You can go mad. Miles and miles of Brands Hatches, with one car per hour coming the other way.