Making peaks not impassable ?

[Akka]

I've got a problem on my hands here...
I would like to make peak passable, but I'm facing a weird problem : after looking in the XML files, it appears that peaks AREN'T defined as impassable (in the CIV4TerrainInfos.xml file, there is "<bImpassable>0</bImpassable>", so with 0 like all other terrains, not 1, in the "peak" text block...).

Though, in the game, they seem impassable enough...
So, how the hell are the peak made impassable ? And how can I correct this ?

 

[Gr3yHound]

hmm...are peaks impassible at all? i think it depends on the units you use...i think you can fly over them, so they are basicly passable and you need to search somewhere else