Jackson Bridge was a proper country ride - any climb that ends with the words "grind it out to the farm at the top" means that you are unlikely to be passed by lots of motor cars!
I'm not sure about riding in isolation totally though - whilst it is nice not to have to worry about wobbling into the path of cars, or hold them up unecessarily, sometimes in your head it is good to have the stimulus of thinking that people are in the car behind me "in awe" of my hill climbing ability (or more likely, wondering why the idiot on the bike is wheezing up a hill so slowly!) Also it can be a big motivator hearing an engine behind you straining as someone keeps it in first gear ready to leap past you!
Jackson Bridge was a 7/10. I think I've worked out in Simon's grading terms that means it is hard work - crossing that threshold from 6/10 seems to mean that it is not a climb to be taken lightly - and I think that is fair in respect of Jackson Bridge.
Jackson Bridge starts off from a pretty quiet little village location
Garmin data here: http://connect.garmin.com/activity/85626186
Youtube video here: http://www.youtube.com/watch?v=i9XQyc5J9do
Flickr here: http://www.flickr.com/photos/100hillsforgeorge/sets/72157626959264874/