12 am and 12 pm
What is wrong with this sign?
The problem is that there is no such time as 12 am or 12 pm! These do not exist! The times are noon and midnight! 12:01 am is just after midnight and 12:01 pm is just after noon. Case law in traffic court is revealing in this regard. Signs like this are held to be invalid!—Regardless of what digital clocks and computers might say....