yellow triangle on your way

How do people react to order? When you see a sign on the street, do you really know who put it there and why they did it? Do you believe that you have to obey it? Or do you just obey it unconsciously? 

The yellow triangle is fragile, it’s obviously fragile, you can destroy it by a simple touch. But interestingly, there’s rarely somebody tried to break it. I even have to break it by myself to show people how fragile it is. But even though I did that, few people are willing to challenge it. Maybe that’s because they still got a way besides it, just narrower.