I did a little research based on the blue crosswalk sign, and apparently a large portion of the rest of the world uses the same convention for their signs. This sign, as well as many others, are controlled by the "Vienna Convention on Road Signs and Signals": http://en.wikipedia.org/wiki/Vienna_Convention_on_Road_Signs_and_Signals

I'm going to go with Canada. Source: it's canada, this just seems appropriate there