The game's landscape - what are the limits?

[Lagarto]

Perhaps the original flatness of the terrain was a compromise, as the AI were very inapt in avoiding terrain obstacles (they still are, to some extent). When the New Guinea map was released, it was a disaster, the AI notoriously crashing head-on into Owen Stanley Range.
By the way, no one else minds the funny-looking zigzags of roads? Nearly 600 views and only two people had something to say?