Sometimes, CTA passengers take matters into their own hands by making up and trying to enforce their own rules of transit etiquette.
For instance, there's the well-intentioned person who posted this neat little 3x5-inch hand-lettered sign in a passenger shelter on the platform at Morse on the Red Line.
"Considerate people keep cell calls brief. ---
Not more than 1 minute."
Now, that seems fairly reasonable to me. What do you think?