I'm no expert on this, so will happily stand corrected, but why don't you check for yourself? Just open up the RND and SCR .mis files (under ...\SilentHunterIII\data\Campaigns\Campaign) in the mission editor, apply some time filters and see how things "change".
I say to do this because different mods have adjusted convoys/traffic etc in different ways to be more realistic/reflective of history.
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