Signs of Snow

During this time of global economic crisis, my impression is that if one is looking for a job, the sign business is the place to go. More and more signs are popping up all over Croatia. Is it due to the fact that standards now have to measure up to those of the EU?

Regardless, I've figured out that the red and white posted signs must be temporary and indicate wintry weather. Here a few of them - some of which are self-explanatory (are they necessary though?), and the last one which is not. Any guesses for number 3?

1. 

 

2.

 

3.