Signs were made for a reason. And that reason would have to be for people to read it. Which is also why signs are posted in places that people can easily see it. They usually contain messages to instruct what you should and shouldn’t do. Just like this sign on the bridge that is telling people that no fishing should be done from the bridge.
However, as you can see in the picture, people still swarmed the bridge with their fishing equipment with them. Clearly showing their intentions to fish – well, some are already fishing anyway. This can only be explained by one thing: they probably can’t read.