@Drank_Spear For the most part I think that they are simply evolved traits, hard wired into most social animals, to serve the purposes of survival and reproduction. They can be distorted and made to serve evil purposes by social engineering, and are often interpreted through cultural filters, so that culture often claims the creation of them, but in fact the opposite is true in that cultural norms are actually produced by natural instincts and emotions influencing the way we think.

The Greek philosopher Solon had a great take on that, which sadly is too long for social media, but to keep it short, as possible, though I shall lose a lot. He said. Every culture, for example, has a different set of funerial rituals, which at first you think means that every culture is quite different. And he went on to explain with an example that. If you asked a Greek to treat his fathers body as a in the way that a Zoroastrian treats his dead father, ( Feed it to wild animals.) then he would be horrified. But a Zoroastrian would be horrified if you asked him to do as a Greek does with his fathers body ( Burn it.). So at first you would think that Greek and Zoroastrian cultures have nothing in common, especially if you only look at a shallow level.

Yet at a deeper level they do in fact have a lot in common, since both do have. Firstly, a way to hygienically deal with a body. And secondly, both have rituals, to help deal with grief, and to bring an end to the love and respect owed to a loved one in life, without replacing it with disrespect for the past and memories. So at a deeper level they are very much the same.

@Drank_Spear road rules not roads. You asked a specific question, so I gave a specific answer. You want to talk roads? They're to conduct commerce mainly but also people movement and if we didn't have them, there would be more environmental destruction with people making their own routes. eg Minimise impact. Don't like roads? Then devise communities that are totally self sufficient so no goods/ services need to be transported to/ from there.. Re transport, I suppose we will revert to the air which will raise other environmental issues and I dare say will have to develop another "societal norm, rule or custom" we don't lie to people about, otherwise everyone will crash into each other.
No comment on my "truth"?

@Drank_Spear Road rules existed before cars and engines, even in the days of horse drawn transport.