I wouldn't mind starting the upcoming trip from Pittsburgh to D.C. and needing to quit in the middle. I wouldn't mind that, but the associated logistical challenges are a bit overwhelming. If you can't finish by bicycle, someone will have to be called in to drive you home from some point along the trail. Then: does that stop the ride for everyone else? Who continues, and how do they get where they need to be?
As the planner, and the person whose parents are driving us home from D.C., these thoughts give me pause and concern. It makes me realize how much easier it is to go on solo adventures, where planning can give way to an approach of just winging it, and making decisions on the fly. I can fix anything, ride a bicycle anywhere, and hitchhike if it all falls apart. But I can't duck and weave if I'm carrying someone on my shoulders.