I was working under the assumption that they would be hardest to build
in mountains, easiest in plains, etc. Someone suggested this..
> If roads are to provide a greater benefit in the mountains, then perhaps
> they should always take 100 stone to build, but varying effort:
> 500 effort in plains,
> 1000 effort in desert,
> 1500 effort in forest,
> 2000 effort in mountains.
-- Rich Skrenta <email@example.com>