This set of signs resides on a pole across Oak Park Avenue from the Oak Park Arms. I parked there recently and happened to glance up at these signs to see if there was something I should know. It's possible there is, but it took careful study to parse the intelligence they are (and are not) conveying.
Apparently, one can park for four hours from 9 a.m. to 4 p.m., Monday through Saturday, but not really because you can't park Monday through Friday from 7 a.m. to 9 a.m. or from 4 p.m. to 6 p.m., but it's OK other times, except you can't park 8 a.m. to 10 a.m. Wednesdays.
The arrow above the signs directs one to the hospital, where you can be treated for confusion.