Good Law!

I've never noticed this when riding taxicabs anywhere else, but when I was in Philadelphia, PA, last week for college touring, I noticed a sign in the taxi.

I'm glad signs like this exist, especially in the city. Do all taxicabs have this sign? I don't believe so. It was just a small observation on my part, but I think it's extremely useful to have this notice posted in the cab. Though one hopes that one proceeds to exit a taxicab using his/her common sense when deciding which door to use to get out.

That makes me wonder how much common sense people actually have today?