Just like the saying in aviation, a good pilot uses his superior judgement so he doesn't have to use his superior skills. All this talk about the tight turns and such is a good conversation... I am just curious if it was out of courtesy or fear of a gang lashing that no one has brought up why one would put himself into that situation in the first place, disregarding their own safety and that of his fellow riders. Anyways I don't type this out of disrespect, I just know posting signs is done generally to protect a person from themselves. Now easy on the retorts if you feel you must.
I think that's a perfectly reasonable question. There may be lots of reasons like herd mentality, not knowing alternate routes, simply "following the leader" so I could see myself getting into that situation if I wasn't leading the ride.
But knowing that I'm not on a nimble little bike, I'm also (almost) always aware of my retreat path, especially when parking. So I'd like to think that I would have seen that I was heading into tricky retreat situation... maybe.
I also ride a bicycle and always ride past the "road closed" signs in case I can get by. Riding a car-free road is an extra treat. Of course, turning around a bicycle is a whole different animal.