Colors and trails ranking on the Inssbruck trail map

If you have a look at this map you will see that there are trails
marked with green but there is no mention in the legend (see the bottom
of the picture) about this trails. What is the meaning of this green on
the map ?

http://www.skisnowboardeurope.com/in...railmap01.html

Also I do not understand the color code:

-black is supposed to mean difficult (the same here in Canada)
-red is intermediate
-blue is easy (In Canada blue means intermediate)

Do the levels of difficulty corespond in Europe and North America ?

The black color seems to be also used for chair lifts, gondolas and
others like these. I can not find "black runs" on that map !!

Can anybode help me to understand this map ?

Thank you