Originally Posted by Flintshooter

Another thing.
Before you start, check with the NPS about any closed sections/detours. The last time I was on the Parkway (in a car) there was a bridge being replaced that forced a twenty or thirty mile detour. A lot of which was on roads I would not have wanted to bike ride on.
Logic says that someone on a bicycle could just dismount and carry the bike around construction, but there is always the chance that some self-important individual could stop you from doing it.