One sign has a column for "MWF" and a column for "T-Th". The latter I guess is meant to mean Tuesday and Thursday, but it sure looks like Tuesday through Thursday.
Another example shows two traditional signs, one says "No Parking Nightly 10PM-6AM". The second says "1 hour parking 8AM-6PM except Sunday." The designer somehow interprets this as allowing parking from Midnight-6AM Sunday morning, but no parking 10PM-Midnight on Saturday night.
Lastly, she uses "T" for Tuesday, "Th" for Thursday, "Sa" for Saturday, and "S" for Sunday. The "T" and "S" should be "Tu" and "Su" to be less ambiguous.
Like I said, great ideas. But I also think I know why the designer gets parking tickets a lot...