Carl, you never responded to this post.
What is the effect of roads that extend into and through cities, towns, and ports on supply and movement? May one use the road through a city, town, or port that has not been captured to trace a supply line?
I think I saw the answer to this one elsewhere. Surprisingly, enemy-controlled but unoccupied towns do not block supply.
May one use a road running through a town to benefit from the road movement rate? This seems more reasonable to me, especially if it's a friendly town, but once again my interpretation is no. Perhaps it's a simplification. Movement into enemy-controlled towns arguably shouldn't be at the road rate, so might as well apply it to all movement into and through cities, towns, and ports.
Again, looking for clarification of this second question.