Fences

Today in Chumash we learned about the importance of establishing fences around the mitzvot, specifically the Arayot. Not only do these fences help us keep these laws and maintain our status as a "kadosh" nation (using the many definitions of kadosh that we have: separate, holy, pure, etc.), but they also add kedushah into our lives. I was wondering what life would be like without such fences. How would society work if we didn't have such fences around the mitzvot and the Torah? How would our perspective change towards the mitzvot, the Torah, and perhaps the entirety of Judaism if we did not have these fences that some of which were established by the rabbis?

Scenario: There is no such thing as traffic lights. There is a set speed limit, lanes on the street, and policemen to pull people over if they do not comply with the laws of driving. However, the government has decided that traffic lights are no longer necessary. Would this work? Would the roads be safe for cars to drive and pedestrians to walk? Personally, I think this would be a tremendous failure. Maybe it is not fair to equate traffic lights with the fences around the mitzvot but it is an example that could be a little bit relevant to the subject at hand.