Every year, zillions of dead randy bugs cause slippery roads in Schwandorf on the Naab, Federal Free State of Bavaria, Germany.
There, the motorists have always been being warned by a general warning sign and an additional note "Eintagsfliegen" (randy bugs). A foreigner would only have ??? on his/her mind. What the heck means 'Eintagsfliegen'? Even Germans wouldn't be aware of a slippery road caused by randy bugs, only the Schwandorfers who know about them.
The traffic regulators should have used an adequate sign. It would mean a lot more for everyone!
Read article and look at the warning sign: