People who blatantly ignore the posted signs

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This is starting to be something that annoys me. We have signs posted up for a reason and I really hate it when people completely ignore even when it's right in front of their face. Not only can it be irritating but it can turn dangerous too. A fine example of this would be people ignoring signs when driving. Just the other day I was on my way to work when this person pulled out of the gas station and decided to turn left. There was this huge sign across from them stating that left turns were not allowed yet they ignored it. This almost ended in a collision for the oncoming cars because they had to suddenly brake for this idiot to turn. Another one that gets me is when I help out at my aunt's donut shop on the weekends. Her shop only takes cash and there are at least 6 signs near the register and display case stating. Yet we still get customers who try to pay with their card. Then when we tell them that we are cash only they try to get on our case by saying that they don't see it mentioned anywhere. Some of the customers can get really rude about it and I seriously want to ask them if they are blind or something. Anyways, just felt like ranting about that because it constantly gets on my nerves. Needed to get it out of my system. And don't you hate it when people do that?