So this happened to me for the first time. I was riding on NoAP to work and it tried to take its usual exit off the freeway. Unfortunately some wanker was blocking the exit lane and it could not get over. Rather than take control, I just let it go to see what would happen.
1) The car decided it could not safely exit, it turned off the signal and proceeded to the next exit.
2) At first it struggled to recalculate in time and switched form NoAP to plain old AP (POAP?)
3) Then it recalculated the route, returned to NoAP and took me a different way.
All in all it worked fine, but the recalculation speed needs to be a bit better.
Thought it was worth sharing since I have not encountered this situation in any of the ~1,000+ trips on NoAP.