I had a question in my IREX exam about pre-flight planning said something along the lines of the freezing level is 9000ft along route WXXX. What altitude should you plan your flight at: (LSALT was about 6100ft)
The track was a westerly heading
a) flight can not proceed,
b) fly above LSALT at 8000ft
and i can remeber the other two (im sure it would help a lot if i could
)