Slippery When Cold

How very considerate. Wiener Linien are warning their customers of icy pavements.
I'm not sure if this is a strategy to counteract class action or mere customer service, but it definitely stands out in the usual Austrian "customer service desert" (Dienstleistungswüste) as we like to call it. In fact, it reminds me of American stickers where your microwave reminds you not to heat pets or your rearview mirror tells you that objects may appear farther away than they are in real life. In Japan, riding an escalator is regarded really dangerous and complicated business judging from the omnipresent recorded voices reminding you where and how to stand and what to do with your bags while on your potentially perilous journey to the next floor.