In Watch Dogs, there are electronic signs that can be hacked. Doing so displays funny messages on them, such as:
ITS OVER 9000!!!
or
YO DAWG I HERD YOU LIKE SIGNS
I was wondering if - aside from the quotes and memes - there was any reason to hack those signs. It doesn't look like the world reacts to them in any way.
What is the purpose of those signs?