Basically, take what is from your truck file, and put it into the terrain file. If you are traveling over texture_gravel, you would have a list of sounds for braking and travel noise based off of speed. texture_tarmac would have a different set of sounds associated. This is currently impossible to do in a truck zip, and it would only make sense if in the map zip. I think that this needs to happen so that the game moves forward. Thanks, and comments?