I'm considering going back to see the Ronde van Vlaanderen again in the next few years, but this time I would like to ride (part of) the course.  I had thought about doing the cyclosport, but I have to admit, sharing the road with a peloton of 20,000 riders is a bit daunting.  Can anyone tell me if the various hellingen ridden in the Ronde van Vlaanderen are open outside of that?  For example, if I want to make an attempt on the Koppenberg in the days before the cyclosport, is there any reason I can't (attempt, that is)?

While I'm asking, I may as well ask the same thing about the various pave sections of Paris Roubaix.  I know you can't, for example, drive on the Trouee d'Arenberg (and the cyclosport doesn't even go there, or didn't this year, according to the website), but could I ride my bike on it "out of season" so to speak?

Any advice would be appreciated.

Thanks!