at some point you would need a lawyer, but these are at very least enforced (if you run zoo and put “one way only” sign and security enforces it - is it legal restriction or not?)
in such situations like zoos, these are typically just recommendations, and actually enforced only at points, e.g. if you are queuing for an entrance or exit only “oneway” gate, it would usually be possible to just turn round, leave the queue and walk back before you reach the gate. Many such oneway segments are actually punctual restrictions that were extended by the mappers to where it seemed to make sense, because points don’t have a direction